Sounds like the sear only marginally locks the firing pin, so it's sensitive to shaking. Better leave it alone.
I had shooting range friends buying new 1911 or other pistols and spending effort and money replacing trigger, spring, sear, hammer, etc, etc, polishing this and that, the purpose was to "improve" trigger pull. Safety was thrown away. Weird enough, no law restricts that. I figured that I'd better go to range alone, for my own goodness.
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