iphone 6s screen keeps going black. Sounds indicate phone is still on, but requires a soft reset before I can view/use the screen
Essentially the phone goes to 'sleep' and the screen won't come back on. If you have music playing and/or the phone is not on silent you can still hear sounds, indicating the phone is still on and running, however the screen is totally black. It requires a soft reset to work. This has happened 3 times already today.
iPhone 6s, iOS 9.2.1