So, I'm going to say I've noticed excessive battery drain lately on the watch where it's not being used very much throughout the day but it's ending up with <10% battery at night for no apparent reason, possibly due to a bug. The scenario: Typically, I take my watch off the charger around 8 am and wear it all day, until around 10 pm. I'd say my usage is very light in the morning. In the afternoon, I'll start playing music from a synced playlist on my watch and connect my Jaybird Bluebuds to my watch so I can run and listen to music. This allows me to run without my iPhone. I'll run for around 30-40 minutes using the Outdoor Run workout on the watch and then I choose End, followed by Save. Next, I'll power down my Jaybirds which causes music to pause on the watch. I'll pull up the Clock on my watch and go about my day. At this point, my watch is around 60% battery. Today, I ended my run at 4 pm. By 10 pm, after very light usage, I'll get the prompt to go into Power Reserve mode. Now, other than running, my iPhone is nearby because my work doesn't have wifi so I need to rely on Bluetooth connection. This issue is only happening to me after running and playing music through my watch to my bluetooth headphones. What I think may be the issue is the watch is trying to Airplay music through my bluetooth headphones after they are disconnected forcing excessive battery drain. My test will be tomorrow where I'll force close the music app after my run and see what my battery ends up at later that night. I won't restart the watch between now and then just to test if this actually is a bug. If that doesn't resolve the issue, I'll try to restart the watch and see if that makes a difference. Has anybody else run into a similar issue? I want to try and get all the data I can before possibly submitting a bug report to Apple.