I own one of these and have had similar issues. I was advised back then to replace the recoil spring and find a box of Italian made Fiocchi 123 Grain ammo and test the gun with that.
Both were done along with a thorough cleaning the the gun cycles like it was new.
The ammo part was explained by saying it is loaded a little hotter than the U.S. version.
All I know is the gun works and I have rat holed a few boxes of the ammo.
NRA Chief Range Safety Officer, Home Firearm Safety and Pistol Instructor
"There are three classes of people: those who see, those who see when they are shown, those who do not see."
Leonardo da Vinci