I had the same thing happen, in the same spot.
Same thing happened to me. They said I had to send it in. I sent it in and it was back within a week after they received it. Repair ticket said "replaced internal parts, serviced chamber". I suspect they replaced the bolt carrier. There was also the orange warning sticker attached to the repair ticket, which states do not use steel or aluminum base, low brass shells. Unfortunately, I believe I have an expensive novelty item here. I do not trust this shotgun for defensive or tactical use (it's intended functions). It may be fine now, but I will not take the chance.