I'm having the same problem with a field model. Tagged.
I read elsewhere that it had something to do with the gun heating up and that would reflect my experience. I started getting a failure to fire after roughly 25 rounds of shooting trap with one other guy. We were moving through the stations pretty quickly and shooting singles and then doubles at each stand.
I'm also wondering if it has to do with the incredible amount of grease the trigger mechanism, shoot the entire gun, has packed in it from the factory. I was thinking about trying to clean or blow that off and simply oil it before the next outing.