Originally posted by Silent Street A related question is how the shutter holding solenoid gets "dirty" in the first place! The mechanism is very, very well sealed. A common belief is that the mechanism just gets tired, succumbing to that whether it is open or closed (open, operating, closed at rest). The thing is damned if it does and damned if it doesn't!
I think the dirt resulting from gear friction (for years) near the magnet sticks to it tightly when a camera is not in use for a certain period of time.