Over the last few days, my battery is reducing by 60% overnight (over 12 hours with no use). The only thing I think I've done is a few days ago I installed the Skype App, as I wanted some kind of FaceTime program. It's not actually running. When I review battery usage the large majority is System UI. Normally the battery lasts a day and a half and usually do almost a full charge at a time, but lately I'm having to do extra charges. Anyone help?