Fixed Lens RFThis forum is dedicated to the numerous and popular fixed lens rangefinders, including but not limited to the Canon Canonets, Konica III and S series, Minoltas, Ricohs, Vivitars, and so many others. Note fixed lens Olympus , Yashicas, Argus and Retina have separate forums.
The most likely cause is that the silvering on one of the mirors in the RF mechanism is coming off. The only fix is to replace the mirror or have it re-silvered. Much cheaper to buy a junk QL and replace the mirror yourself, or you can have a pro do it if you are uncomfortable doing it yourself.