Nice theory well thought out, and well POSSIBLE! Question 1: why not use a technological rather than biological memory retrieval system? Question 2: Likely they had movies or stories of a creator's creation turning on them (like Terminator or Frankenstein's monster) and would have put precautions in place, after all they lasted long enough to become Trans-sentient so shouldn't they have seen it comming? Although we really, really like your theory, it just seems too... well predictable for such an advanced race.