Recently after fully charging my watch (vivoactive 4) it discharges very quickly during first hour (up to 10%) and the battery life is reduced. If I then fully recharge the watch again after an hour this does not happen and it has a slightly more acceptable battery life. Update, today after first charge 10% gone in one hour, after second charge 8% gone in 3 hours, so looking at maybe up to 2 days. Any ideas?