Sounds like there might be a lose fitting somewhere, that worked its way back into place. I dropped my old Minolta film camera, twice, in two minutes (the only time I've ever dropped a camera). The pop-up flash broke, but nothing that a bit of sticky tape couldn't fix. It wasn't worth doing anything about, and it continued to work fine, anyway (still have it). With your A200, because of a possible fault and problems in the future, I'd go down the insurance replacement route.