What did CZ tell you after they looked at the pistol on both occasions you described?
Does your RAMI exhibit this behavior with different types of ammunition?
How about magazines? Have you tried more than one magazine, and if so is the malfunction present with different magazines?
Have you tried the "plunk" test with both barrels? (Remove both barrels, use the same identical round of ammo, and drop the loaded round into the chamber of each barrel with the barrel muzzle turned straight towards the floor). Does the loaded round fall fully into the chamber of both barrels, or does it only seat partially in the barrel from the pistol that is giving you problems?
Unless the malfunction is being caused by something very obvious and apparent, I would eliminate the above three possibilities, as they are easy to do and can be done at zero cost. (Assuming you already have some different types of ammo!)
Good luck with your issue, and please keep us on the forum informed regarding resolution.