My workhorse camera has been a 35mm film Canon EOS650, about 20 years old. I haven't a huge investment in lenses, but do have the standard 50mm, 180mm, 35-70mm zoom, and 170-500mm (pretty crappy) zoom, all autofocus but from 3rd party manufacturers. Last week it started doing strange things; part of the last roll of film was intermittently blank. It seems to record the picture, but then advance the film a random number of frames. I replaced the battery, but still seems to behave about the same. I'm thinking since it has worked so well up to this point, that the repair shop is the first step. Anyone see anything like this before? Eventually I'll 'prolly go digital, but really don't want to spring for the Canon D-60 (to use the lenses) right now.