After upgrading to iOS 7, I have been getting a notification to verify my iCloud password a number of times. Maybe once or twice in a day. I don't know whats wrong. The only change is that I cannot reinstall apps that I had previously done and deleted. The sign of iCloud with a downward arrow appears and then when I tap on it, a doughnut circle appears with moving blue, and then again changes back to the iCloud symbol. I have the app store on the home screen, but when I close it by pressing home button, it ends up on the last page of apps of the 4 which I have. All help would be appreciated. Anyone know whats wrong?