I've haven't had too many problems with mine.
Last fall I had an issue with the tire pressure sensors. They would start dinging for no apparent reason. I would stop and check the pressures and there would be no problem. Then all of a sudden it quit doing it. Hopefully, I will not see any further problems (knock on wood).
Also, there is the issue with the gas tank. When you fill gas, it likes to spit at you. Some people say it happens to them while filling. For me, it does it when the tank gets full. I avoid it by not filling the tank all the way or slowing the pump down when I think it is getting full. There is a TSB on that. I didn't know that it could be fixed under warranty until after the warranty was up. I bought my KK used a month before the original warranty expired.