It wasn't until I upgraded to ios 11 that my iphone 6 began shutting down at 30% battery. This coincided with the phone being completely unusable. I could not l

It wasn't until I upgraded to ios 11 that my iphone 6 began shutting down at 30% battery. This coincided with the phone being completely unusable. I could not launch apps, using the message application was nearly enough to make me quit apple.