Well I tried Estate, Remington, and Winchester ammo, and found they all did it. I took it to the dealer, and they looked it over, and found that it was hanging up, said it was Benelli's problem, and gave me a new gun.
The gunsmith is one way to go, but why should I put money into something that is only two weeks old.
The shop is Sportsman's Loft, in Minot ND. It is a first rate place, and the guys are honest and knowledgable.