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That sounds as if the control console is either failing and erratic, or else perhaps its connection to the motor controller board through its wire harnesses is somewhat loose.
It might have gotten that way, if it either has been stored for a while in a slightly dusty or grimy place, or else if it has been moved and the connection(s) between the control console and the rest of the machine have perhaps been yanked on or otherwise stressed.
If so, re-seating the control console's wire harness connections to the console, would be the first thing I would advise.