I have a Mamiya 645 I purchased a while back. The problem is when advancing the film it doesn't stop at the next frame, there is a click the shutter is released and it continues to advance. The film advances, the mirror flips up and the shutter open and shuts without pushing the shutter button. The film advance knob seems to trip the shutter somehow? The film counted does advance each time but the mirror stays up sometimes or flips back down while advancing the film. I was wondering if anyone has had this problem and if so how to fix the problem? I don't think it's the insert because I have tried another insert and it still has the problem. Thanks for the help in advance!
