Ever since upgrading to iOS 9 my Iphone 6 has this weird behavior were I would unlock the phone and the screen will just freeze, no touch response , nothing. It takes about 30-60 seconds to be able to use the phone again. I even tried the 9.1 b4, same result. This happens to me at least 11 times a day... which is a lot. Has someone else experienced something similar? And yes, I did try full restore, back up, etc etc etc, including a phone swap.