I don't have iOS 7 because its not available on my device but I have been told that since iOS 7 was not created for the iPhones 4 and 4S, if you get iOS 7 on either of those devices, you will most likely experience many problems and small glitches. iOS 7 isn't for iPhone 4 and 4S. It's just available with them. So if you have either of those devices, it's just another iOS 7 glitch. Hopefully, apple will sort out the glitches and there will be an update (iOS 7.0.1 I'm guessing) I hope your device goes back to normal soon!