I was really frustrated with my R2A for a couple of months...the take up spool had no torque and the beginning of all my rolls of film would have a dozen overlapped images. Then one day I took the triggerwinder off and everything was fine. I realized the film rewind release button on the triggerwinder was putting a little preassure on the button on the camera and that was causing the issue.
Fixed and I'm a happy camper again
Besides that, no other issues with my R2A.
With my R2 the screw on the rewind crank kept loosening. I tightened it and put a dob of nail enamel over it and it's been okay since.