Samsung Washer Door Lock Problem

I have model WF56H9100AW/A2 washer. When starting the door lock light goes on & the door locks, 5 seconds later the machine dings & the door light lock goes off & the door unlocks so the machine won't go into wash cycle. The mother board & wiring harness have been replaced twice. Is the whole problem in the door switch latch itself? The codes tell Samsung the motherboard & wiring harness but that did not fix the problem. Help please.