Your wrong on the door switch it could be shorting out in that circuit causing it to stop midcycle but it's rare you'll see that if it initiates to begin with. Check underneath the unit for a small leak going onto electronic components some of these models will leak slowly and cause malfunctions but yet not leak enough to see it coming out in front of the unit. Check your heating element and circuitry your element should be 50 ohms or less. Inspect all your wiring throughout the harness and check all connections throughout system make sure they are firm and have good clean contacts. Check your electrical for the unit make sure you have black to black white to white and a ground wire is essential on modern appliances with electronic boards. The fact your not blowing out your thermal fuse and you have no fault code leads me to suspect you have a problem with possibly the main board which controls everything essentially. Wouldn't hurt to inspect the drain pump and sump pump for obstructions and continuity. Good luck
This is your part if everything else you inspect is good and in good working order.
Parts for Kenmore Dishwasher 66517352301 - AppliancePartsPros.com