u/Admirable_Ad541

So I've been shooting film for some time and recently had to buy a new camera. Bought from analogue shop. Its a minolta x500 and it was listed as near mint. I've shot 4 rolls now. All of them failed on me on shot 20 or so. Ive put a video to show what it looks like but at the start the rewind and iso knobs are nice and snug but after like shot ten I can see the iso dial getting more loose and the rewind starting to push itself up. I have no clue to what the problem might be. Any help would be appreciated!