HA UI wont load after restart

Hi, I have problems to get HA UI to work after reboot the VM.

I’m running Hassio on a VM with HA 0.92.2.
Because I didn’t see the “Update availible to 0.93.0” screen on the hassio Dashboard, I tried to restart the VM.
Now I have no access to the UI. There is nothing really special in the Log file. The hassio addons seams to work fine like IDE or SSH. ( with the ssh addon there is an error: zsh: corrupt history file /root/.zsh_history but I think thats a problem with the addon)
Hass.io is up and running, too.
I can execute commands directly in the VM CLI screen

I tried:

  • restarting VM a few times
  • restored a snapshot from yesterday via cli

Everything looks normal but its not working…What can cause the problem? Please help!!

Log:

2019-05-20 00:18:20 WARNING (MainThread) [homeassistant.loader] You are using a custom integration for customizer which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you do experience issues with Home Assistant.
2019-05-20 00:18:20 WARNING (MainThread) [homeassistant.loader] You are using a custom integration for custom_updater which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you do experience issues with Home Assistant.
2019-05-20 00:18:22 WARNING (Recorder) [homeassistant.components.recorder] Ended unfinished session (id=1 from 2019-05-19 22:12:09.847034)
2019-05-20 00:18:29 ERROR (SyncWorker_4) [homeassistant.components.octoprint] Endpoint: printer Failed to update OctoPrint status.   Error: HTTPConnectionPool(host='192.168.2.24', port=80): Max retries exceeded with url: /api/printer (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f663342a828>: Failed to establish a new connection: [Errno 113] Host is unreachable'))
2019-05-20 00:18:32 ERROR (SyncWorker_4) [homeassistant.components.octoprint] Endpoint: job Failed to update OctoPrint status.   Error: HTTPConnectionPool(host='192.168.2.24', port=80): Max retries exceeded with url: /api/job (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f6631dd5390>: Failed to establish a new connection: [Errno 113] Host is unreachable'))
2019-05-20 00:18:33 WARNING (MainThread) [homeassistant.setup] Setup of group is taking over 10 seconds.
2019-05-20 00:18:34 WARNING (MainThread) [homeassistant.loader] You are using a custom integration for shelly which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you do experience issues with Home Assistant.
2019-05-20 00:18:49 WARNING (MainThread) [homeassistant.components.sensor] Setup of platform octoprint is taking over 10 seconds.

Edit:

What I noticed.
During the first reboot, the supervisor is updated from v.163 to v.164. And after the Snaphot restore the SU is also v. 164

I found the issue!

During troubleshooting I noticed, my Raspberry with the unifi controller died.
So I disabled the unifi component and restated HA. Everything works fine again.
But its strange that there were no log entries!!??