I have an iPhone 6, 128GB, running iOS 10.1.1 which has decided it no longer wants to be my friend. At least 3-4 times a week the iPhone will have a sudden drop in battery life, going from say 55% to 11% not ideal especially when you need for phone for plane tickets. The drops can be anywhere from 20-65% from what I have seen. I have no background apps going, I close them when I don't need them. And my phone is always in low power mode. Also from time to time, has happened 3 times this week alone, my phone will just shut off and display the flat battery symbol when I try and turn it back on. This can happen anywhere from 40% to 75% again not an ideal thing to happen. The moment it gets plugged back in turn on and displays whatever the % was before it turned off. My questions are: 1. Does this happen to any other iPhone 6 users? 2. Does anyone have any ideas on how to fix the issue, or help it happen less frequently.