I have seen this on doubles and as stated above, it is generally dirt or a worn or broken sear surface. Wear general comes on gradually. If it started suddenly, it is either something thatwas deposited quickly or a chipped or broken part. Either wear or crap laying down general comes on slowly in my experience. It may start failing to hold cock suddenly, but would generally give a lot of warning by getting lighter and sloppier over a period of time. Try a good soaking cleaning first maybe. If mechanical, anything that is working but not correctly can generally be repaired by a competent gunsmith. A sear and notch are pretty simple but must be shaped carefully.
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