If the ammunition is new and in spec, I am guessing the following:
- Debris inside the mechanism.
- Sear ledge on the hammer is chipped or worn.
- Bent or twisted slide spring
I would strip the pistol and completely scrub the sear/hammer engagement area. Take the grips off and get into the double action mechanism as well. Check to see that the slide spring does not kink or bind. See that the sear ledge on the hammer correctly engages the sear.
Make sure the safety/decocker moves freely and is not binding the hammer area.
If the ammo was old or been subjected to oil or lubricant near the primers, this could also be an issue. Did the invididual discharges all feel like they were at full power?
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