I just purchased a Minolta X-700. I put new batteries in, and everything worked for exactly one shot (the shutter fired, and I could even hear the beeping of the meter). But after that, the lever would advance but the shutter wouldn't fire. If I turned the camera off and on, it fires exactly once before quitting again. What's up here? I've tried using an eraser on the battery area, etc. Why does it only work once?