Odd, just turned it on for mine (4s) and it's working fine. Super Hexagon first suggestion!
It's not a widespread problem but for people like me that do have it there's pretty much nothing we can do to fix it besides waiting for a future software update. The only other thing I can think of that might fix it is to delete my iCloud backup and restore the iPhone so all the software is brand new but FUCK ALL THAT I'll just wait for the update to this very minor problem.