Known issue with the firmware on the radio that RTCOA & Comcast uses for the CT-30. Most times just taking the top cover off where the wires are, and pressing the reset button, then waiting for it to reboot. After rebooting the thermostat, press "Menu" and then under the antenna icon, press the "Mate" icon under the antenna. Sometimes the thermostat gets out of sync with the remote server.
The reboot and resync helps.
The reboot and resync helps.