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Paul, sounds like a bad connection in the socket on the controller, maybe check inside the box to see if you have a broken solder joint or crack where the motor socket joins the board.
Also check (but I'm sure you've done this) the RJ45 socket, clean the wires etc.
Sounds to me like the feedback from the motor to the board is not working, so the board doesn't think the motor is turning. The board stops the motor power so that it doesn't burn out, which would likely happen if the motor really was stuck.
cheers, Bird
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