NC and CC stop working occasionally

Hey,

I don't know what invokes this bug yet, but from time to time Notification Center and Control Center stop working. I can't pull them out from anywhere... Is anybody else having this problem? I'm using iOS 7.0 (obviously) on a iphone 5.. It's really annoying; I have to restart my phone everytime.. So does anyone have a clue how to avoid this, till there's a fix by Apple?

PS: I remember I've seen this problem on beta 3..