I have a German PPK/S made in 1971 and it never gave me any problems at all. I've fired 1-2K of reloads (RNL and JHPs) and carried it for many years.
The P22 I don't want to discuss . . . do a deep-dive Search here for my story on that gun, including the alleged fix that made it reliable finally (for the next owner).
I carry a P99 .40 frequently and again, it's been 100% reliable with everything I've fed it.