I have a configurable joint that is free to only rotate on Z and is attached at a specific linearLimit to another rigid body to act like a hinge. All other motion is locked.(X,Y,ZMotion and X,Y Angular Motion. I add Velocity to the rigidBody with AddForce to get it to spin either direction using finger drag (iphone). If you get it spinning too fast it seems to suddenly hit 180 degrees and bounces back the other direction losing most of it's momentum. I can't get it spinning fast enough to continue spinning in a circle without hitting this problem.
Any ideas why this would happen and how to prevent it?