Seems like I remember reading, here, that there was a batch of bad springs CZ used several years ago. They went through a spell of broken trigger return springs, CGW started having better quality springs made and the CZ issue pretty much went away.
I remember a guy on another forum who bought a P09 9MM. He loved it. Shot great. Trigger return spring broke. He called CZ USA and they had him ship it back for repairs. He got it back and he was happy, for two weeks till the replacement broke. He got it fixed again and sold it.