Up until Friday, the phone would last all day on a charge. Thursday, went to bed with the phone at 80%... it was dead in the morning (it went peacefully in its sleep). Since then, it takes a loooooooong time to charge and then dies very (!) quickly. And, of course... the phone is a mini space heater. I've reset, restored, restarted... nothing. What happened to my 5? Thanks!