Haven't seen this mentioned here yet: My battery life is decent, comparable to most everyone else around here, but I notice that once the percentage reaches a certain level (typically anywhere from 25-40%) it will shut off. So I plug phone up and it will restart and charge after resetting. I understand the battery percentage isn't linear and can be off a bit but should I be concerned about this? Had a genius appointment and they have already wiped the phone and reinstalled firmware. Anyone else had this happen?