The seller offers me compensation or repair refund so i think i get the estimated repair cost and have it repaired.
I guess that this behavior will lead to exposure problems eaven in "normal" mode. The shorter the exposure time the bigger the problem.
for the lens "firing" i just remeber this statment i found on youtube (might be true or not)
This is DESTRUCTIVE for your lens. The pin is not a release button, but a Holding-Lever. When on a camera, this pin is pushed away after the tension of the cocking ax of the lens is taken over by the ax of the camera. The pin called Latch 065 turns on a tiny brass srew, which get loose or brake when used as a release button. Wilco Jansen 40 year experience in Hasselblad repair in the Netherlands.
-> Source: http://www.youtube.com/watch?v=uHD1qOXSxQw