Series 4, updated to the latest watchOS paired with iPhone updated to the latest iOS I've noticed for the past couple of weeks that the watch doesn't always fully charge overnight like what it used to do. It doesn't happen every night, but lately has been happening more often than not. Even if I haven't received the low battery warning before going to bed (ie, the watch hasn't even hit 20% battery remaining), I'll get up 6 or 7 hours later and it will only be at 80-85%. A few times, it was only in the 60% range. I've rebooted the watch multiple times over the course of the last couple of weeks to see if this helps, but it's difficult to tell if it does or not. Again, some nights it will charge fully over the same length of time, even if it had dropped below 10% charge remaining. Has anybody seen similar behavior? Along the same lines, I've noticed that I've hit the low battery warning more in the last couple of weeks than what I used to, with generally the same or similar usage (ie, I'm not doing anything that would burn through the battery).