I have the Nest thermostat and the downstairs one was off of wifi for ages. It complained that the battery was too low for wifi so I got one of these.

After I installed it, it was charging and then fell off of the wifi for, you guessed it, low battery.

This morning I rebooted the thermostat and it's been working since then on wifi.

I literally tried the IT Crowd solution and it worked.

Sigh. This toot will probably jinx it. #ItSoWill #INeedMoreCoffee #GoogleNest