After 20+ rolls through my Canonet QL17 with no problems...until the last frame of a 36 exp roll. When reaching the end of this roll the advance lever jammed at max stroke. After trying a few things, push this, turn that, I removed the bottom plate. What I found was the film transport indicator "red striped decal" had lost it's adhesion and had fallen off sometime before I owned the camera , making its way down through the body of the camera. When on the bottom plate it became lodged in the teeth of the two gears of the film advance linkage. I straightened out the decal and glued it back on to it's "little flag" under the top cover. I am happy to have found the problem. This "poor man's Leica" is a joy to use. If you have one, check to make sure the indicator is still visible behind the small window.