Yes! This started happening to me three nights ago. I charge my watch before bed so it is never below 98%. My alarm, went off at 4:00am and I worked out for 45 minutes (I used other workout for tracking). I didn't notice the battery percentage until my watch buzzed to tell me it was low...15%. I turned it off to charge it and it took forever to charge. It worked fine all day and I charged it before bed again Monday night. The exact same thing happened Tuesday morning and again today. It lasts all day long, but something is going on at night. I have now set my phone as a backup alarm because I am afraid the watch is going to die completely and the alarm won't go off. I LOVE my watch so this is incredibly frustrating.
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