worn sear not catching on the hammer notch, or vice versa. allowing it to ride down to the next position, but not letting it fall all the way... That would be the first place I would look. How does it do when the slide is cycled by hand? Check pin wear too on those parts...I have a Colt .380 Gov't model That shoots well and doesn't jam,But when I fire it it ejects the shell and puts another one in the chamber but the hammer remains down. Can anyone tell me what is causing this problem?