Problems / Errors ProCeed

Hello guys, I’m driving a ProCeed Mj20 in advance and I’m very happy with the car which I wouldn’t have allowed. Since I’ve changed from a Stinger and I don’t want to talk bad about the car. But I still have some points that bother me. Maybe you have the same problems as me and you can help me to show possible ways to fix them. 1. The already known problem with the wave-like acceleration has caught me and is still waiting for me. a solution on the part of Kia. 2. Rappeling noises from the rear (presumably the tailgate) 3. crack in the area of the roof sky at the height of the driver’s side 4. Interference noise in the area of the navigation system (sounds like plastic rubs against each other and thus gives noises of itself. Thank you already. Greetings Flo