It's bad enough that on most film, there's enough left over for a 13th frame, without being stuck with only getting 11. It sounds like the lock that engages when you get to frame 12 must be tripping early.
I'm with Paul though, the easy fix is to send it to someone who has the tools and knowlege to fix it. FWIW, it's not something I've encountered in the 3 A12 backs I've owned.
Barry
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