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Have a look at the cam follower inside the lens mount, as you focus the inside of the lens runs on it and moves the rangefinder.
If it's when it's cold it could be that arm needs greased.
Mine gave some trouble with the rangefinder lagging behind the lens focus. A clean and oil of this arm sorted it.
Is the rangefinder patch not clear anymore, or does the rangefinder patch not overlap quite completely?