My son purchased a used 1911 a while back and I happened to be the first person to fire it at the range. About every third round it would do an automatic double or even triple tap. It was kind of cool but spooky at the same time. We had a little for for a while. He ordered a new sear for it and the problem was resolved.

Being that this is a new 1911 I would definitely send it back to the manufacture for factory repair. You should have no problem with the manufacturer stepping up to deal with the repair.