Had it happen to me some years back at a farm pond I would fish. You could catch this bass twice a day, everyday, for about a month always in the same laydown. Turned out, it had a soft plastic lodged deep in its throat. This was before I knew how to get a gut hook out (thank you BR). I believed it was starving and in turn, was super aggressive. I hoped the hook would rust out before the fish died but it didn't turn out that way.