Hi,
I am using HassOS on a RPI3. HA stopped working on the weekend and I am trying to find out what happened. I can still connect via SSH.
I did not change anything, neither in my LAN nor on the RPi itself. I was not even using my computers at the weekend 
Some background:
OS Version: Home Assistant OS 5.13
Home Assistant Core: 2021.4.3
ha > info
arch: armv7
channel: stable
docker: 19.03.15
features:
- reboot
- shutdown
- services
- network
- hostname
- timedate
- hassos
hassos: "5.13"
homeassistant: 2021.4.3
hostname: hassio
logging: info
machine: raspberrypi3
operating_system: Home Assistant OS 5.13
state: running
supervisor: 2021.06.0
supported: true
supported_arch:
- armv7
- armhf
timezone: Europe/Berlin
ha > login
# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
680eec6e1bc0 ghcr.io/hassio-addons/wireguard/armv7:0.5.1 "/init" 36 hours ago Up 36 hours 0.0.0.0:51820->51820/udp addon_a0d7b954_wireguard
ff0949422ecc ghcr.io/hassio-addons/nginxproxymanager/armv7:0.10.1 "/init" 36 hours ago Up 36 hours 0.0.0.0:80-81->80-81/tcp, 0.0.0.0:443->443/tcp addon_a0d7b954_nginxproxymanager
c879c7b7644a hassioaddons/appdaemon3-armv7:5.0.1 "/init" 36 hours ago Up 36 hours 0.0.0.0:5000->5000/tcp, 0.0.0.0:5050->5050/tcp addon_a0d7b954_appdaemon3
d92d80253b65 homeassistant/armv7-addon-ssh:9.1.3 "/init" 36 hours ago Up 36 hours addon_core_ssh
2d0a68f6bc52 homeassistant/armv7-addon-mariadb:2.3.0 "/init" 36 hours ago Up 36 hours addon_core_mariadb
d6bd67977333 homeassistant/armv7-hassio-multicast:2021.04.0 "/init" 36 hours ago Up 36 hours hassio_multicast
ce9c5bcdb42b homeassistant/armv7-hassio-cli:2021.05.1 "/init /bin/bash -c …" 36 hours ago Up 36 hours hassio_cli
e94335a6faae homeassistant/armv7-hassio-audio:2021.04.0 "/init" 36 hours ago Up 36 hours hassio_audio
588b19e167b7 homeassistant/armv7-hassio-dns:2021.04.0 "/init" 36 hours ago Up 36 hours hassio_dns
c08596db4dde homeassistant/armv7-hassio-supervisor:latest "/init" 2 days ago Up 36 hours hassio_supervisor
a9cedbc6d532 homeassistant/raspberrypi3-homeassistant:2021.4.3 "/init" 2 months ago Up 15 minutes homeassistant
7d220738d776 homeassistant/armv7-hassio-observer:2020.10.1 "/init" 2 months ago Up 36 hours 0.0.0.0:4357->80/tcp hassio_observer
For some reason it looks like it cannot connect to the services (IPP printer, Fritzbox, MELCloud, …) anymore, a ping command shows that they are online and I can reach them from other computers just fine.
bash-5.0# cat home-assistant.log
2021-06-14 09:35:31 WARNING (MainThread) [homeassistant.loader] You are using a custom integration duofern which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2021-06-14 09:35:31 WARNING (MainThread) [homeassistant.loader] No 'version' key in the manifest file for custom integration 'duofern'. As of Home Assistant 2021.6, this integration will no longer be loaded. Please report this to the maintainer of 'duofern'
2021-06-14 09:35:31 WARNING (MainThread) [homeassistant.loader] You are using a custom integration helios which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant
2021-06-14 09:35:31 WARNING (MainThread) [homeassistant.loader] No 'version' key in the manifest file for custom integration 'helios'. As of Home Assistant 2021.6, this integration will no longer be loaded. Please report this to the maintainer of 'helios'
2021-06-14 09:35:51 WARNING (MainThread) [homeassistant.components.binary_sensor] Setup of binary_sensor platform hassio is taking over 10 seconds.
2021-06-14 09:35:51 WARNING (MainThread) [homeassistant.setup] Setup of counter is taking over 10 seconds.
2021-06-14 09:35:51 WARNING (MainThread) [homeassistant.setup] Setup of input_text is taking over 10 seconds.
2021-06-14 09:35:51 WARNING (MainThread) [homeassistant.setup] Setup of input_datetime is taking over 10 seconds.
2021-06-14 09:35:51 WARNING (MainThread) [homeassistant.setup] Setup of duofern is taking over 10 seconds.
2021-06-14 09:35:51 WARNING (MainThread) [homeassistant.setup] Setup of tag is taking over 10 seconds.
2021-06-14 09:35:51 WARNING (MainThread) [homeassistant.setup] Setup of media_source is taking over 10 seconds.
2021-06-14 09:35:51 WARNING (MainThread) [homeassistant.setup] Setup of input_number is taking over 10 seconds.
2021-06-14 09:35:51 WARNING (MainThread) [homeassistant.setup] Setup of system_health is taking over 10 seconds.
2021-06-14 09:35:55 WARNING (MainThread) [homeassistant.setup] Setup of input_select is taking over 10 seconds.
2021-06-14 09:35:55 WARNING (MainThread) [homeassistant.setup] Setup of input_boolean is taking over 10 seconds.
2021-06-14 09:35:55 WARNING (MainThread) [homeassistant.setup] Setup of zone is taking over 10 seconds.
2021-06-14 09:35:55 ERROR (MainThread) [snitun.client.client_peer] Challenge/Response error with SniTun server
2021-06-14 09:35:55 ERROR (MainThread) [hass_nabucasa.remote] Connection problem to snitun server
2021-06-14 09:35:56 WARNING (SyncWorker_0) [pyfritzhome.fritzhome] login failed 0000000000000000
2021-06-14 09:35:56 WARNING (SyncWorker_1) [pyfritzhome.fritzhome] login failed 0000000000000000
2021-06-14 09:36:00 WARNING (MainThread) [homeassistant.components.homekit] The 'auto_start' option near /config/configuration.yaml:151 is deprecated, please remove it from your configuration
2021-06-14 09:36:00 ERROR (MainThread) [homeassistant.components.sensor] The openweathermap platform for the sensor integration does not support platform setup. Please remove it from your config.
2021-06-14 09:36:00 ERROR (MainThread) [homeassistant.components.sensor] The nut platform for the sensor integration does not support platform setup. Please remove it from your config.
2021-06-14 09:36:06 WARNING (MainThread) [homeassistant.components.cover] Setup of cover platform opengarage is taking over 10 seconds.
2021-06-14 09:36:06 WARNING (MainThread) [homeassistant.config_entries] Config entry 'Brother-MFC-L2700DW' for ipp integration not ready yet: Invalid response from API: Timeout occurred while connecting to IPP server.; Retrying in background
2021-06-14 09:36:06 WARNING (MainThread) [homeassistant.config_entries] Config entry 'fxxxxxx.org' for melcloud integration not ready yet; Retrying in background
2021-06-14 09:36:07 ERROR (MainThread) [homeassistant.components.hue] Error connecting to the Hue bridge at 192.168.10.11
2021-06-14 09:36:07 WARNING (MainThread) [homeassistant.config_entries] Config entry 'Philips hue' for hue integration not ready yet; Retrying in background
2021-06-14 09:36:11 WARNING (MainThread) [homeassistant.components.sensor] Setup of sensor platform darksky is taking over 10 seconds.
2021-06-14 09:36:11 WARNING (MainThread) [homeassistant.config_entries] Config entry 'FRITZ!Box 7590 (UI)' for upnp integration not ready yet; Retrying in background
2021-06-14 09:36:15 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:36:15 ERROR (MainThread) [homeassistant.helpers.event] Error while processing template: Template("{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}")
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 376, in async_render
render_result = _render_with_context(self.template, compiled, **kwargs)
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 1327, in _render_with_context
return template.render(**kwargs)
File "/usr/local/lib/python3.8/site-packages/jinja2/environment.py", line 1090, in render
self.environment.handle_exception()
File "/usr/local/lib/python3.8/site-packages/jinja2/environment.py", line 832, in handle_exception
reraise(*rewrite_traceback_stack(source=source))
File "/usr/local/lib/python3.8/site-packages/jinja2/_compat.py", line 28, in reraise
raise value.with_traceback(tb)
File "<template>", line 8, in top-level template code
File "/usr/local/lib/python3.8/site-packages/jinja2/sandbox.py", line 407, in getattr
value = getattr(obj, attribute)
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 1351, in _fail_with_undefined_error
raise ex
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 1343, in _fail_with_undefined_error
return super()._fail_with_undefined_error(*args, **kwargs)
jinja2.exceptions.UndefinedError: 'None' has no attribute 'attributes'
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 483, in async_render_to_info
render_info._result = self.async_render(variables, **kwargs)
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 378, in async_render
raise TemplateError(err) from err
homeassistant.exceptions.TemplateError: UndefinedError: 'None' has no attribute 'attributes'
2021-06-14 09:36:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:36:16 ERROR (MainThread) [homeassistant.components.template.template_entity] TemplateError('UndefinedError: 'None' has no attribute 'attributes'') while processing template 'Template("{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}")' for attribute '_state' in entity 'sensor.phone_line_status'
2021-06-14 09:36:17 WARNING (MainThread) [homeassistant.components.homeassistant.triggers.numeric_state] Error initializing 'Warn about UPS OG battery runtime' trigger: In 'numeric_state' condition: unknown entity sensor.ups_time_left
2021-06-14 09:36:17 WARNING (MainThread) [homeassistant.components.homeassistant.triggers.numeric_state] Error initializing 'Warn about UPS battery runtime' trigger: In 'numeric_state' condition: unknown entity sensor.ups_basement_battery_runtime
2021-06-14 09:36:28 WARNING (MainThread) [homeassistant.components.media_player] Updating samsungtv media_player took longer than the scheduled update interval 0:00:10
2021-06-14 09:37:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:37:29 ERROR (MainThread) [homeassistant] Error doing job: Task exception was never retrieved
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/components/ssdp/__init__.py", line 82, in async_scan
await self._process_entries()
File "/usr/src/homeassistant/homeassistant/components/ssdp/__init__.py", line 129, in _process_entries
await asyncio.gather(*tasks)
File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 131, in async_init
result = await self._async_handle_step(
File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 214, in _async_handle_step
result: dict = await getattr(flow, method)(user_input)
File "/usr/src/homeassistant/homeassistant/components/fritzbox/config_flow.py", line 140, in async_step_ssdp
if entry.data[CONF_HOST] == host:
KeyError: 'host'
2021-06-14 09:38:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:39:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:40:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:41:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:42:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:43:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:44:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:45:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
{% endif %}'
2021-06-14 09:46:16 ERROR (MainThread) [homeassistant.helpers.template] Template variable error: 'None' has no attribute 'attributes' when rendering '{% if is_state("sensor.phone", "idle") %}
Phone is idle
{% elif is_state("sensor.phone", "dialing") %}
Calling {{ states.sensor.phone.attributes.to_name }} ({{ states.sensor.phone.attributes.to }})
{% elif is_state("sensor.phone", "ringing") %}
Incoming call from {{ states.sensor.phone.attributes.from_name }} ({{ states.sensor.phone.attributes.from }})
{% else %}
Talking to {{ states.sensor.phone.attributes.with_name }} ({{ states.sensor.phone.attributes.with }})
Please help - I don’t know where to look further.
Thanks.