Same thing happened to me.
After a power failure, the LCD, the App, the Web Interface, and the Cloud account are all unable to communicate with sensors "more advanced" sensors like the thermostat. Lamp modules still work but not thermostat.... get the standard cannot update status, refresh and retry, or other message. 2nd time I've had a power outage and this has happened on R080. I have to re-join the sensors that aren't working after power fail which sucks.