G4LIfe, It could be a trigger return spring with insufficient tension, or the rebound slide binding, I would first take the grips off, hose it down good or soak it in solvent, if it is nickel definitely don't use hoppes #9, simple green and water heated on the stove would also be excellent. Then blow it dry and lube with a good liquid that will allow it to penetrate without disassembly. I like FP 10. Cock the hammer and dribble some lube down from the top as well. You never know. I have had pistols that WD40 had been used and then put away, and the nature of WD turns to a very hard wax. Good cleaning solved all the problems.