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The only thing that would cause the dishwasher to turn on by itself or stop mid cycle would be the main control board itself. You can try to flip the circuit breaker off to the dishwasher for 5 minutes to see if the electronics will reset, but if the issue re-occurs, you'll need to order and replace the main control board. Below is a link to the control board which is about $86 and it's located below the tub along the right side so the dishwasher would need to be pulled out to replace the part.
CLICK HERE for control board
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