The touch screen on my iPhone 6 Plus randomly becomes unresponsive. The home button and all the other buttons work, just not the touch screen. Its happened about 10 times already. It either gets stuck for 10-20 seconds or does not respond until I turn it off and on. Even after shutting it down and turning it back on it still occurs randomly. I've tried restoring it and it still happens. It's a 128GB iPhone 6 Plus AT&T.