The selector assembly which engages the hammer assembly is finicky; it either is loose and falls back into safe when being fired, or it doesn't engage the hammer assembly and remove it off safe when switching the selector.
If it's loose, tighten the screw underneath the rear sight.
If that's not the problem, you might need to cock the gun when in semi or full. I find with my 18C that if I rack the slide in safe and then switch to semi or full, it's still stuck on safe. Cocking it when off safe solves that issue.
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