When my 5s is plugged in to a wall charger, the screen becomes oversensitive. Just moving my hand anywhere near it causes it to to do whatever it feels like. When plugged in to a computer for charging, it is fine. One other thing- when the phone is plugged in to the wall charger, it is within a few feet of my old 4s, which is on and charging. Possible interference maybe, or is something wrong?