I shoot in Manual mode exclusively. I use the Main Control Ring (behind the shutter button) to control my shutter speed. Recently it has started to malfunction. When I try to increase my shutter speed, it sometimes does nothing, sometimes it decreases the shutter speed, and sometimes it does what it is supposed to do.
Perhaps it is getting worn out from so much use. Hopefully, there is a fix that won't involve sending it in for repair.
I have one RF lens that I mainly use, so I use the control ring on the lens to adjust ISO and reassigned another dial for my shutter speed.
