That's such a shame when these start acting-up.
If the light leaks are usually an easy fix, a worn-out film advance is another thing.
I have a Minox35 that gave-up the ghost before I put a single roll through it. When I muster-up the courage to open it up again, I'll probably end-up soldering the contacting springs that connect the electronic board to the body in the hope to start it again.