Hey Haenzel -- I love Ricoh SLRs but don't own either of this model.
Have you seen this behavior when the cameras are loaded with film? I know there are some cameras that behave a little differently when you first load film -- for example they disable auto mode so you don't get a long delay when shooting and advancing film to the "1" position.
I'd suggest loading the camera with film, keep the shutter cap on, lens at its smallest aperture and shutter at its fastest speed. You should be able to fire off a couple of shots without exposing the film. Once done you can rewind it (don't rewind the leader into the cassette, obviously) and re-use the film.
Normally I'd chalk this up to an electronic glitch but with two cameras of the same series doing it, I have to wonder if it's some sort of a feature!
Incidentally that's a Ricoh model I did not know about and will look into. I have a few in the late-70s/early-80s series, including two copies of the Sears KS Auto (XR-2s). It's one of my favorite walk-around, knock-about cameras -- works beautifully and I don't think I paid more than $20 for either of them.
Aaron