Switches missing after update to 12.0

Hi - Each time I try to update my HA to the latest version and it restarts I get the error that no country selected. Then I select the country and restart.

Then many of my switches does not show up on lovelace anymore. I can still access those switches by IP and console shows we are connected to HA.

If I then downgrade HA to previous version all switches comes online again, Please assist

Country is a new thing. You can set it in Settings > System > General.
You should only have to do it once.

You can also do it in configuration.yaml

homeassistant:
  country: ISO_country_code_here

edit: for clarification, it is the alpha-2 code and you can find them here.

Thanks but even after that I am still having issues with switches missing and HA getting really slow. Once I revert back to older HA version all is fine

yes, sorry, my answer was only regarding country. I can’t advise on the switch problem.