Is this a different problem than your other topic where thermostat issues are also being discussed?
In any case, it seems you have a Radio thermostat, and staff appear to be investigating similar reports of issues with some of these in recent builds (e.g., Rule Machine suddenly having problems with thermostat - #6 by bravenel). I suspect your issue may be related, so waiting for this fix or, for the time being, rolling back to a build where this worked for you for might be your best bet.
