ERR_CONNECTION_REFUSED even after backup

Hi. after writing some things about light in configurations.yaml i did reboot and im now getting ERR_CONNECTION_REFUSED error. I tried to do backup from unpacked snapshot files since i have access to files through samba and after backup i still get this error. Maybe it has something to do with todays 108.3 update?

EDIT: Downgrading to 0.108.0 didn’t solve the problem

Here is my configuration.yaml

# Configure a default setup of Home Assistant (frontend, api, etc)
default_config:

# Uncomment this if you are using SSL/TLS, running in Docker container, etc.
http:
   base_url: xxx.duckdns.org
   ssl_certificate: /ssl/fullchain.pem
   ssl_key: /ssl/privkey.pem

# Text to speech
tts:
  - platform: google_translate

group: !include groups.yaml
automation: !include automations.yaml
script: !include scripts.yaml
scene: !include scenes.yaml

google_assistant:
    project_id: xxx
    service_account: !include xxx.json
#    exposed_domains:
#    - switch
#    - light
#    - group

samsungtv:
  - host: 10.0.0.39
  
switch:
  - platform: mqtt
    name: "Sonoff biurko"
    state_topic: "stat/SO_biurko/POWER"
    command_topic: "cmnd/SO_biurko/POWER"
    availability_topic: "tele/SO_biurko/LWT"
    qos: 1
    payload_on: "ON"
    payload_off: "OFF"
    payload_available: "Online"
    payload_not_available: "Offline"
light:
  - platform: mqtt
    name: "Światło"
    state_topic: "stat/swiatlo/POWER"
    command_topic: "cmnd/swiatlo/POWER"
    availability_topic: "tele/swiatlo/LWT"
    qos: 1
    payload_on: "ON"
    payload_off: "OFF"
    payload_available: "Online"
    payload_not_available: "Offline"
    
frontend:
    themes: !include_dir_merge_named themes

    
lovelace:
    mode: yaml