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The Lego Company is usually very good about replacing broken and defective parts for free. In the case of expensive electronic parts such as this, in my experience, they will sometimes request you send them the broken/defective one. If this is the case, they will make it easy for you and send everything you need to do so with your replacement. Because ...


3

It sounds like the motor is "winding up" from drivetrain deflection. Lego parts "give" a little when stressed and therefore store some energy like a spring. This is likely being caused by the high speed of the PF "M" motor. A picture of the assembly would be very useful in determining a solution. Without seeing it, the simplest fix would be to gear down ...


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