I bought a 2021 Kia Sorrento Platinum AWD diesel for my wife. It was our first car with DCT and so I knew the common intricacies about them. I found the common to a stop and the DCT thumping into a lower gear or getting into neutral was getting worse as more mileage was put on the car. We are now at 28,000 kilometers and can't put up with it anymore. There are 3 problems I have found with the transmission. 1 - It just seems like the clutch activates too slow when coming to a stop which creates the thumping. 2- when reverse is selected, not matter how long you wait after you rotate the dial, it thumps into gear or feels like there is no slip of the clutch. 3- when in Park and handbrake engaged, there is a slight surge as if the clutch is engaging and then disengaging. It happens in a cycle of 8 seconds apart.
I took the car to the dealer to have it addressed. The dealer experienced the same issue i told them about but they have to get a technician from KIA Australia to look at the car. It could be off the road for a week or more. The dealer will provide a courteousy car while it is off the road.