Our KitchenAid dishwasher (ours is a KUDS30IXSS4, but I think this applies to any KitchenAid with an adjustable top rack) is just over one year old and the rollers on the upper rack are already broken, which causes the rack to come off the rails. The plastic tabs holding the rollers on break:

I couldn’t find a DIY on this and was nervous about breaking more cheap plastic bits while making the repair, so here you go. Rollers are part of the rack adjuster assembly, link is to Amazon which seemed to have one of the cheapest prices. Even if only one of them is broken probably not a bad idea to just do both of them, as this is likely a cheap plastic temperature cycling issue and when one goes they are probably all on the verge of going.

Taking the rack out is easy, just flip the little retaining clips at the end of the rails to the open position.

The three lower clips holding the roller assembly to the rack are easy to remove. The outer ones just slide to where a cutout releases the assembly (pop the long slider one off the rack).

The middle clip is removed by squeezing the tabs together, you can do it with your fingers, or gently with a screwdriver (if you are going to break something this might be it).

The adjusting gizmo has a door with two tabs on the top and a couple of pins on the bottom. Pry the pins clear of the body with a screwdriver, then slide the door down and off.

Putting it back together is the opposite and easy. I don’t think you can goof up on this, but the thinner arm of the blue springgy thing needs to fit into the roller assembly, not sit on top of it.

Poor design/cheap materials. If I were a competitor I would jump on this. Appliances should not break after 14 months.