Hello! I just got a warranty replacement for my iphone 5 from the Apple Store. Phone is in immaculate condition. However, when I have it plugged in..the touch screen is almost always unresponsive. So much in fact that I have to unplug it from the charger to swipe to unlock. When I unplug it, everything works fine. Could this be because of the charger, or is it something ios 7 related, or is it a hardware issue? Any help would be appreciated! Thanks!