If you get to the second stage (optical link) face, then lose the game, the head turns to the third stage instead of back to the first stage. It was doing this once in a great while, but now it seems to be doing in every time.
I've tried recalibrating the head and reseting the machine, but I'm not so good with the mechanics and if it's a problem with the motor I have no idea what I'd be looking for to diagnose.