My nest thermostat dial does not respond to any inputs. I can click on the center and access the main screen but turning the dial does not have any affect. I have removed the thermostat from the base and squeezed it like a hamburger for 15 seconds and reset the unit multiple times. This is not resolved my issue. It was working one day and then the next day it was not working. The thermostat has not been modified in anyway or opened. What can I do to resolve this?