I have an iPad2 and recently I have had issues with a pop-up notification that will not go away, and prevents me from exiting the screen and even turning off the iPad. The latest one was "firstname.lastname@example.org FaceTime unavailable". This pop-up notification would not go away when I hit the "cancel" button, nothing happened. When I tried to reboot the iPad, it would not let me. I pressed the home button and sleep button and in the back ground, the "slide to power off" button came up, but, since the FaceTime notification would not go away, I could not access it. Has anyone else heard of this or know how I can fix it??