6-7 years ago -- when I was one of the moderators on the old CZ Forum, there was a large batch of new guns from CZ that were delivered with crappy (defective) trigger springs. A bunch broke. CZ-USA identified the problem and fixed it quickly, but it did happen, and it happened to more than a few CZ Forum members; I don't know how many others had the problem.
CZ also had some problems with extractor springs -- probably a design issue -- and solved the problem by installing higher-power extractor springs, and that problem went away. We'd buy them from Wolff until CZ started getting them into the production guns.
Then there was also a problem with the firing pin retention roll pin which could break with heavy dry-firing. (CZ said "don't dry fire" in their manuals, back then, and supplied a cheap snap cap.) They subsequently doubled the roll pin (putting a smaller one inside the existing one), and that problem went away, too.
I've been following these guns for 10-12 years, and except for a couple of misaligned (out-of-spec) holes on the frames for a handful of CZs, which led to broken slide stops, those are about the only problems I can think of.