SLK R171 BJ 2010 – Door and fender: varnish bursts off

Hello Motor-Talker I bought a SLK 350 in February. First registration in June 2010, was a demonstrator in Düsseldorf with 5,800 KM. I noticed already at the first washing that on the doors and on the fenders behind the paint is slightly damaged. Meanwhile, the paint bursts up ever further (see pictures in the appendix). Before I drive to Mercedes I wanted to ask first here whether someone else has already done this or knows this problem?! Clamping the door is very unlikely, if then it would be clamped deeper. And then also on both sides…?! Perhaps doors and fenders have touched each other?! But why then only at the very top?! The gap measurement is the same everywhere at the door to the fender. Thank you very much for your help! Greetings, Markus