Battery Drain With Alarm Clock Function

This just started happening to me last week.  I have 4 alarms set during the week days...in case I hit the 'Dismiss' button by accident. These alarms have been set since I got my phone in October. Well, last week I noticed that after the 4th alarm had gone off, my battery had gone down to 48% while still plugged into the charger.  This phone is usually on the charger all night with no problems and at 100% by the time I leave for work...until now.  Any ideas why this might be?
I currently am recreating the issue by setting my alarms for PM and seeing if there're any changes.
Thanks!

I set the alarm clocks for PM.....but of course it didn't do anything abnormal. So I set them again for the AM. The next morning, my alarms went off as usual, and the battery stayed fully charged. So I am at a loss as to what was going on previously.  My only conclusion is perhaps the mini USB was not completely inside the port ????  If anything new happens I'll be sure to post.  So far the past two mornings have gone without a hitch.  Go figure!

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