One of my A12 backs recently started spacing irregularly, some frames overlapping a bit, some spaced too widely. So it is in the capable hands of the wonderful, 80-something year old technician whom I take my equipment to for repair and maintenance. His wife, who is eastern european like him, works in the shop. One day she left me a message to the effect that "Hasselblad camera is r-r-r-r-ready to peek up."
When he finally retires (or more likely dies while working on a camera) I am going to have to quit photography.