Hallo Carsten,
I haven't had any problems for two weeks.
I have disconnected the battery and I have follow the procedure in the user manual to reset the windows. The first time that I disconnected, I followed the procedure on the dashboard screen. The difference between the two procedure is the windows movement order. With the procedure on the dashboard screen, I had the problem again a few hours later.
I don't know if it's the solution, but I'm quiet for to weeks.
Damien