I serve as technical support for a wide range of people, and I seem to be getting an influx of people running various types of 10.x.x having battery issues in regards to the phone shutting off between 40% and 50%. The phones are iPhone 6 and 6s. All users report this happening after the upgrade to iOS 10. I have noticed this on my personal device. It died at 49% once! Has anyone noticed this issue?