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Originally Posted by Al Skierkiewicz
I think that the problem is that the RC when disabled has an open circuit output with no loading. This leaves the servo to pick up crosstalk from any wiring around it and interpret that noise as a valid PWM command.
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Our cam servos did this same thing. Our's did it's antics only when disabled and not when motors were running. We had the camera data and servo signals running in the same SHIELDED wire (no outside interference). The serial data is +-15V and the servo ports are open (high impedance) during disable. The +-15V was 'jumping' from the serial data to the open servo wire and the servo had no idea what it should do this this random data. Electrical engineers, please excuse my terminology!
We solved the problem by running separate individually shielded wires up to the camera. Problem solved.