Nothing wrong, per se, with this thermostat it's just very limited in its functionality. Also setup is a mess. You can't use a normal wifi router that everyone has now, you have to use an old 2.4 ghz router or it will fail. This is ancient and should be updated. Luckily I was able to move everything over to my guest wifi and modify the settings there
This thermostat is amazing, I literally renewed my lease because of it. I love being able to control it from my phone especially when I am not home. I also get a discount with my electric company and 50 just for registering it!