Never had the ejection issue with mine however my buddy was having a lot of ejection issues in general with his. Most of the time, the round would be stuck in the chamber when he pulled the bolt back. We don't know if it was the round getting stuck in the chamber after being shot or something to do with the extractor. He sent it to CZ, they had it for around 2 or 3 weeks I believe, claimed they couldn't replicate the issue however they said they replaced the extractor and spring anyway. Shot his first match with it this past Saturday and didn't have any issues what so ever so that's good.
Interesting, Mine is extracting the round out of the chamber just fine, it just doesn't kick out the last round on the 10 RD mags. The position in which the follower rests seems to be different on the 10 round VS 5 round mags as well.