I'm having a problem with my M6 and am curious if anyone else has encountered something similar. I've had the camera a while and shot hundreds of rolls with no problems. But last week the camera stopped advancing midroll. The advance lever feels as if it is pulling against tension as if it's at the end of the roll, but instead it's in the middle. I can rewind the film (with tension initially) and have wasted several rolls experimenting with the advance and rewind, with similar results. The film always gets stuck mid-roll. I've taken the baseplate off midroll and it seems to be loaded and spooling properly, and before this latest problem I ran many rolls through the camera with no issue. Before I send it off for repair, does anyone have any experience with this problem?