Since a few weeks the battery of my Vivoactive 4S is draining much faster than it used to do. Now overnight (about 8 hours), the battery went from 100% to about 80%. I didn't change anything on the watch. Also, after a factory reset with removing all data, the same issue still occurs. Is there anything I can do to fix this battery drain issue? Firmware on the watch is the latest one (7.80). I'm using default settings (like they are after the factory reset).
