Early on, a few FNP40s had an issue with the trigger housing cracking in front of the hammer. There was a slight change made which either added or left more material in the problem area and I have not heard of revised pistols having troubles. Actually, I generally read very good reviews.
I have 2 FNP40s, close to 3000 rounds through one, 300-500 through the other and both have been flawless except for failure to feed on American Eagle 165grain FMJ. Maybe 10 FTF between the two guns in 1000 rounds. No issues with any other ammo.