The reason I keep coming back to the thermostat box is because when it acts up sometimes the entire display goes blank, like it's not getting power at all. Then, randomly, it will come back on again and I can turn the AC or fan back on. Sometimes the digital display stays on and it just licks off like it's reached the target temperature. Sometimes the screen flickers like a loose connection. I'm thinking of just taking it apart to see if there's something loose inside. Also it seems like this isn't a very expensive unit, the same one lists on Amazon/eBay between $50-$100.