Google’s API for Nest has been garbage since they bought Nest. I finally got fed up with non-stop errors and the device going offline in HA that I replaced it with a Honeywell and now it’s totally local and hasn’t missed a beat.
After the last homeassistant os update ,system restarted (which i have been doing a couple of time last weekend due to companion app testing which required a restart of HA) the google nest integration doesnt work, however it still shows me the last video doorbel activity / stream so it is not completely dead , but the thermostat isnt working any longer… Hopefully it will be working again soon (after update of HA software).