Bluetooth pairing has stopped working. Tried signing out of app and back in, uninstalling app and reinstalling, disabling Bluetooth on the 510, disconnecting phone from the 510, and forgetting device from iPhone. The phone shows that it's connected. When I start the 510 it asks me to allow Garmin Connect. When I do, Garmin Connect launches but there's no sync and the Bluetooth icon blinks but no connection.