I had had a few issues with the same model. Switched to Geco Semi-Auto loads and function has been perfect.
Damned fine ammo, that Geco S-A stuff. I have a CZ 512 that thinks it's candy, it will shoot 1/3" at 50 yards with it, Not bad for a 4.5lb. autoloader. I'm down to my last dozen boxes. I shoot it spariingly now.