This was sudden, no drops or anything. Made a phone call then tapped the button to see what things I had running to close down, went to swipe a few things off the screen and ,,, nothing. Screen will not respond to swipes at all. Was hoping to shut it down and reset it, but can't even do that as you have to swipe to turn the damn thing off. Iphone 6, any ideas what could have caused this and is there a way to shut it down without having to swipe ? What is the warranty on these things ?