Had our new Ring doorbell for over a year. All fine. Chime has decided not to work. Unplugged it and waited ten seconds. Plugged it back in. Blue light flashes once then nothing. Held the side button in for a variety of durations from 5-60 seconds and no green light. Have deleted it from my app to try to reinstall but still the same. WiFi good. Power good. Nothing has changed. Help!