I recently bought a Nest thermostat and regret it. Two months in and the wifi went bad. Apparently a common problem. Support agrees to send me a replacement, but they end up sending it to the wrong address.
I had the same issue, but support kept disconnecting me and I had to start all over again going through the entire “try all of the brain dead stuff like resetting” 3 times, before I finally gave up and just ordered a new Nest and ate the cost.