I had a KA DW with similar problem. I replaced it with a Bosch that has a reachable rinse-able set of filters in the floor that I rinse clean weekly.
The KA built up deposits ( looked like oatmeal) that would get stuck on the sides of the upper basket itself and behind the flat plastic "channel " that goes up the back wall of the dishwasher and then forward to the arms. also the upper sidewalls and back upper corners. use a flashlight to see.
I got quite adept at disassembling and rinsing clean all of it. everything snapped out and back in again, but it did not show how to do this in the manual. I watched the repair guy when I had the first pump replaced. I think I needed a screwdriver somewhere but nothing technical.
there was no "filter" like the bosch has. instead of going out with the water, the small debris would collect especially in the places I mentioned. the water flowed freely thru the arms, no blockages. Behind the flat plastic piece up the back wall is where a large amount of crud lodged. as the crud built up, I would start getting more and more stuck on mostly upper rack dishes. I tried cleaning cycles, vinegar etc but the debris did not budge.
I took the baskets out and carefully took it apart but the problem kept recurring. I'd had the pump replaced once already so I finally bought the Bosch.
I don't know if it was a design flaw or another pump failure. I had to clean it about monthly and I got tired of it.
"If the world were a logical place, men would ride side saddle." Rita Mae Brown