If the problem disappears when there is no ammo in the chamber, it is undoubtedly your extractor. Remove it by pressing down slightly on it and pushing the pin out. The well it sits in is rather deep and can acumulate a good amount of debris. Make sure this recess is completely clean and that the extractor and spring show no damage or excessive wear.
If this area is clean and in good order, the next thing I would look at is your mainspring.
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