Since approx. 5 days i have issues with the nest thermostat. I won't connect to the wifi anymore. I have tried resetting network and resetting all settings to default but it doesn't resolve the issue. After that i tried resetting router and modem and that didn't help either. I have also tried turning of the 5ghz wireless on the router + connecting the thermostat to a different access Point but also that didn't help. all my other devices can freely connect to the wifi.
Kind regards Livai
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My 3rd gen starting having the same problem earlier this year. I was interested to see that you tried turning off your 5Ghz WiFi; that's basically what fixed mine. In my case, I created a new SSID in the router that is 2.4Ghz-only, attached the thermostat to that and now it's rock solid again. FWIW, my thermostat is running software 6.2-22.