Guess you should open the top plate and see what´s locking the frame counter at #10.
It´s a simple mechanism. Fixing it should take half an hour or so.
My guess would be that the mechanism that prevents double exposures is sticking. Next time it jams, press down on the shutter release a few times and then try to advance the film. Greyhoundman is the expert on GSNs who could tell you exactly what the problem is.
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