It means that the Radio unit in the thermostat is not connecting to the servers. You can try taking off the top cover of the thermostat and press the reset button to reboot the thermostat. Then press Menu and Mate, to sync the thermostat with the radio. Also try unplugging the router for the Home system. That may resolve it. If you still get the problem. Then there is something wrong with the radio module and needs swapped out.
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