That's a real shame to hear of this quality control issue with Benelli. Hopefully they'll resolve this issue.
Ive shot a variety of benellis most of my adult life (everything from "tactical" to "hunting" versions..
I bought my wife a Super Vinci several years ago.. at the time it was being touted as their flagship duck gun (they just discontinued it last year)...
The gun had pretty bad feeding issues once it got even just a little bit dirty.. and also had issues with once the gun got dirty the safety would lock into position (whatever position it was in.. whether safe or fire mode)..
I was amazed to find out (after much googling) that this was a pretty common problem with the Vinci's and Super Vinci's.. and was considered by many to be an unfixable design flaw... that Benelli knew about.. but continued to sell the gun for year without ever attempting to fix it..
In a nutshell, the way the trigger housing is designed, funk gets down into the safety and blocks the button from being able to be manipulated in either direction (too tight of tolerances).. same situation with the lifters.. which creates the feed issue..
So much for it being a "flagship"...
Ive been able to mostly sort out the problem now that I understand it.. the gun gets A LOT of compressed air into the trigger housing and gets thoroughly cleaned after every couple of boxes of shells (1 good hunt)... While using the gun (whether hunting or on the range), I manipulate the safety numerous times to make sure I am pushing little bits of powder and debris out of the channel before it accumulates..
Its now "my" shotgun (added in several spacers, etc to get the LOP to where I need it vs what my wife shoots).. Ive been able to take it on a handful of hunts, and put it through some very harsh conditions (ducks in Alaska during a snow storm, etc).. and haven't had it lock up on me while in use since I figured things out... BUT... you really shouldn't have to put that much effort into keeping an $1800 hunting shotgun running reliably..
If I were to do it all over again.. I'd pick up another Berretta A400 and not look back..