My Polaroid prints all the photos in the pack without interruption

Hello, my Polaroid SLR 680 has a problem, even though I've been using it for over 10 years without any problems.
Every time I connect a new pack of photos, the camera releases all the films one by one, as if I had my finger continuously pressed on the shutter button. If I try to stop the process by pressing the shutter button, the process stops, but when I remove my finger, it starts again. Do you have any ideas?
Thank you for your help.