Has anyone heard of any problems with the '09 KX450f front brake rotors? A friend of mine has one and the rotor is actually moving circularly on its own. Its almost of if the hollow rivets that hold the inner and outer part of the rotor together has come loose. It does have some play side to side, but so does mine on my '08 klx450r. The main movement is front to back, or during the spinning of the wheel.