I got a new iPhone 6 two weeks ago and proceeded to restore the firmware via iTunes before restoring from my iPhone 5s backup. But last Thursday and today the phone out of the blue showing the apple logo on a black background (just like when one turns the phone on). This used to happen to me to an iPad mini that I returned because it did this exact same thing on iOS 8 about once a week it would do that very same thing. No matter what I did it never could alleviate that. Not restoring the firmware me seeing up the device as new. Does anyone have any tips on how to fix this?