Most thermostats would fail in that timeframe. Our original Nest thermostat failed this year because the connection that turns on the furnace wore out or became thin. Caused our furnace to click on and off repeatedly and ruined a relay on the furnace’s circuit board. Had to replace the thermostat and the furnace circuit board. Costly repair. Upgrade your thermostat before it wears out.

Our smart thermostat has never been all that useful to me. The main thing is I don't have to walk over to it to change the temp. But that convenience isn't really worth the $150 I paid for it.