What the heck happened, my battery went dead after 3 hours in the case. I usually get 16 hours. I had it in the case on my hip and went to look at a email and the battery was in the red after only about 3 hours. I usually get 16 hours with normal use. I have had the phone since Nov 6 and this never happened in the past. Was there some sort of update or something that made the battery drain so quickly?