Hi all! So, I recently got an Apple Watch Sport. It has been working great, and I've been getting 2-3 days on a single charge. Well, last night I put my watch on at 4pm. I first rebooted (powered off and on my phone and the watch - hadn't don't it in awhile). At about 8pm, I got the message from the watch asking if I wanted to go into power reserve mode at 3% battery life. My phone battery, however, was still ok. Any idea what happened here? I recharged it last night and it is currently at 100% now. Do I need to do something else to the watch or phone? Has anyone else experienced this? Thanks much!