I was on the App Store looking at my previous apps that I've purchased and all of a sudden the phone locked up and a green screens with vertical lines popped up and turned off my phone. The phone then rebooted to the lock screen and every time it would lock up again and I would see green and red lines. This cycle went on for about 10 minutes. It's back to normal now, but I'm sure that can't be good. ATT 32GB White iPhone 5.