My Garmin Lily Classic watch face stopped displaying anything. I have already tried to reset by pressing and holding the circle (at the bottom of watch face) for 20-30 seconds. the watch vibrates but nothing happens on the watch face. The Garnin app on my iPhone was still synched and showing my activities for a few days but now says the bluetooth is disconnected. I cannot reconnect without my watch face display! How can I fix this problem?