I talked with the guy at ATKdrones yesterday and he says they believe they have figured out a fix for the yaw motor erratic behavior as it might not be the motor at all, but rather the circuitry. I guess they are going to try to replace one of the circuit cards and see if that is a good fix, otherwise a replacement will be the only option. I have one on back order from DroneNerds.com, should be here next week.