This has happened to me a couple times after I plug in my Razr Maxx to a USB charging cord. At the lock screen, the phone is pressing the numbers 7 and 8 repeatedly by itself and won't stop. I literally cannot make the phone stop pressing numbers on its own at the lock screen, and I think it's trying to make an emergency phone call. This has happened a couple times after plugging phone into a charging cord. I then need to do a soft reset by pressing power button and volume down button for several seconds to fix the problem. What is going on??