Have 4 3 2 on my iPhone. Had it on charge all night long, and it didn't charge. Only noticed it at 20% at work. Had this iOS for a week already, only now had this happen to me. Strange.
I plug iPhone and iPad at night. In the morning unplug and go to work. I make a call from my car outside home. It could not have lost 80% in time it takes for me walk to my car.
Came home, plugged, seems to be taking charge. I'm really clueless right now. Gonna watch that it takes charge at night I guess, and then that it's charged in the morning.