Nikon has the same problem. Camera Control 2 just locks up at some point. I never counted but it probably is around 100-150 frames. I only get to these numbers when shooting models which is the worst time for it to lock up. It also locks up after approx 5 minutes of running LiveView. LiveView sometimes runs sporadically during those 5 minutes, sometimes not. If it locks up I have to force quit the app or wait a minute or two for the beachball to stop spinning. The only fix is to bring production to a halt, quit CCP2, turn off the camera, relaunch CCP 2, then turn the D3 back on.
I hate to say it and no offense, but I'm kinda glad to hear it's happening to canonites too. I've been holding off buying D3x's until someone fixes this screw up. Apple had better fix this sooner rather then later.