Hello and welcome to Fadu Chris. It sounds like something is sticking. It could be the lens aperture/shutter. And by the way, I presume you are aware of the correct procedure to remove and put your lens back on, which is that the camera should always be in the cocked position right?
And/or a sticking light baffle/mirror issue.
In any event, because many of these cameras were the workhorses of the professionals it's probably time for a service and it should give your RB a new lease of life.
__________________
MartyNL
“Reaching a creative state of mind thru positive action
is considered preferable to waiting for inspiration.” - Minor White, 1950
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