Is anyone else having issues with their iPad locking up and not turning on since they updated the OS on Monday? Since I did the upgrade my iPad locks up and the only way to power it back on is to do a hard reboot. I took it to the Apple Store and told them I did the update, did the hard reboot, then it was fine. All was good for about 4 hours this morning, I used it a bit, then went to use it just now and it was locked up again and would not power on. I'm gonna have to go back to the previous OS.