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Besides the controller possibly a kink (broken wires) in a cable running to the motors, or bad connection. Contact cleaner and a tooth brush maybe.
Try swapping the RA and Dec cables and see if it's the same issue with the same motor.
If you're mount is running the similar DIN plugs to my Skywatcher EQ5 Pro I know the female pins can get spread with female DIN plugs though my Skywatcher is quite firm and the sockets seem to be a decent quality where wobbling cables in and out isn't so easy (less chance of spread pins), I've more seen it with old audio gear (everything had DIN plugs back in the 70s).
Still worth checking and you would have experience doing such things.
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