PSA AKs are starting to show abnormal failures.. Have never heard of a real AK folder crack.. but here is a PSA AK folder that has cracked.. A number of other issues out there, broken extractors, abnormal peening and wear on bolt/trunnion contact surfaces..
Basically no one in the US has figured out how to build something the rest of the world has been building for roughly 67 years or so.
http://www.akfiles.com/forums/showthread.php?t=335168
IO, Century, DDI and now PSA.. All ticking time bombs. DDI showed some promise but they bailed as soon as someone offered them some money, makes you wonder how they felt about the viability of what they were putting out long term.