Be sure to post back what CZ has to say. My Scorpion SBR has been boringly reliable with a variety of ammo (IMI, PMC, Blazer, WWB, AE....mostly 115 and 124 gr.). The only issue I ever had was with one batch of 147 Speer TMJ. I had two boxes and it choked in both my Scorpion and MK25 (both suppressed). Same range trip, same ammo. I chalked that up to a funky batch. That was about 1500 rounds ago, and the only issue I ever had.
Good luck, man. I know that has to be irritating.