Nest suggests recharging and restarting your thermostat to resolve the glitch and get it up and going again. Sometimes your nest thermostat may just freeze up and you wont be able to navigate around menus or do anything with it but luckily theres still a way to reboot it.

How To Fix A Nest Thermostat That Keeps Going Offline
Nest the thermostat is shutting down. Nest thermostat manual must watch if you have a nest duration. The first thing to try probably not surprisingly is turning the thermostat off then turning it on again. All you have to do is press down on the unit itself for around ten seconds until the screen shuts off and begins rebooting. To do this press the thermostat ring then go to settings reset restart ok. Wait a few moments and note if the nest turns itself back on or not. Nest thermostats that were updated at the end of 2015 or beginning of 2016 to software version 513 or later may have some issues including becoming unresponsive not efficiently charging the battery or shutting down completely.
How to install the google nest learning thermostat duration. One hour smart home 2341 views. To perform a reset simply press down the nest and hold it in for about 10 seconds in which you will see the nest go black as if its powering off. My furnace keeps shutting down. A manual reset of the nest thermostat seems to be working for most people with these annoying issues. Just to clarify do you think this is a larger hvac problem or something specific to the thermostat.
Ok so my nest thermostat keeps shutting off and i found out the problem. Looks like hvac so i take off the door and put it back on and it starts right up.