Auto load cameras often wind too much film into the camera on the initial load. I had several, back in the day, that did the same thing. A repair center may be able to recalibrate the initial winding sequence, but honestly, its not worth the trouble. As far as cost goes, well, you are losing a potential photo, but you are also not paying to process that photo, so you come out ahead unless you are developing/printing your own. You may have the same issue with a 24 exp role. You might try some different types/brands of film just to make sure your cameras sensors arent just being finicky. If they work, maybe your sensor just needs cleaned.