How old is your CPP2? If it doesn't have the latest, stronger motor, then you might have an old one and the motor is just worn out from those expert drums. Just a guess. I use my to do printing in expert drums and had the same problem. Unfortunately, the upgrade entailed a new circuit board, etc, etc, and was very costly. Hopefully, someone out there knows exactly what motor JOBO uses (I am sure they don't make the motors themselves) and can recommend a reasonably priced substitute. Good luck!