My iPad 2 does not want to lock. This is not a hardware problem because if I keep the sleep/wake button pressed I am propted to "Swipe to power off". If I enable assistive touch and select "Lock Screen" nothing happens. I have restored it 3-4 times know it is running iOS 6.1.3 not jailbroken. I have not been able to find my solution anywhere. I am just really confused because it worked before I updated.