@googlenesthelp It started happening approximately 6 weeks back, I have run all troubleshooting steps suggested by the Nest support team last time, including reconnecting the wire, restarting, manually entering the Wi-Fi user and password. Came the same conclusion as last time, broken Wi-Fi.
@googlenesthelp I have two nest thermostats, believe it is gen 2. One failed connection to the Wi-Fi, google sent a refurbished replacement. It worked for few months, Unfortunately it is having same problems all over again.