We actually have two of these models, the other is now 7 years old at another house we own. We have always had good luck with KA appliances. Even after our bad experience with this one, we likely would have replaced it with another KA. Before this dishwasher we had an older Bosch that didn’t dry well (no heating element). My wife really likes this dishwasher. It cleans and dries well and holds a lot of dishes. We really didn’t want to replace it. Thanks also to everyone on this forum who posted pictures and comments. They were all very helpful. Forgot to mention the most important thing. Before attempting any appliance repair, be sure to get permission from your significant other! Mine couldn’t be happier.

Doesn't matter which cycle. Rinse/Hold is fine ... just add a tablespoon or two directly to the tub, let the machine swish it around and drain. Fabric softener kills suds in washing machines so it'd surely do the same in a dishwasher ... very little should be needed, less than a tablespoon. Dishwasher detergent ideally should not generate any suds. Suds interfere with rotation of the spray arm, dragging it down from proper speed ... and can also cause a vapor lock on the pump, starving it for water, reducing spray pressure and resulting in bad washing/rinsing performance. Rinse aid is a sort of detergent or soap and can cause sudsing in the final rinse if the dosage is too high for the water conditions (hardness). Dispensers inject just milliliters of rinse aid. Adjustable rinse aid dispensers typically release from 1 ML at the lowest setting to maybe 5 ML at the highest. 1 teaspoon is 4.9 ML. No "regular" liquid hand-dishwashing detergent in the household? Seems a little odd, LOL. Sudsing can be caused by residue left on dishware that has been sloshed in soapy water in the sink and then loaded into the machine.

I'll mention that all the new DWs I've seen lately now use a hose connection similar to a garden hose, just smaller. With its own rubber gasket, one can put it on by hand. Some units come with the proper elbow (which you put on before putting the unit under the counter), others you need to get one from the box stores when you get the hose (and electrical stuff). Anecdote: my friend had a flood when she started the machine before going to the grocery store. The drain hose either popped off or ruptured, I forget which. Ruined the parquet floor, subfloor, and ceiling in the garage underneath the kitchen. They ended up replacing all the parquet with tile.

Your dishwasher's fine. You have a leak at the supply-point. Sort of cross-over plumbing/DW problem. The guy to call is the appliance guy. They are amply familiar with these connections. It will be a small deal. From your description, I suspect fill-solenoid or its connection. Either/both are easy. Neither should be left alone. Do it now.