and we used Fiocchi ammo for the first time today. In the past we have used PMC and Magtech. Any ideas what could be causing this many failures?
Seems youve answered your own question.
I'd take it right back and try proven ammo again... it would nag at me for days if I didnt.
It sounds like weak ammo to me - failing to lock back on last round, stovepipes, and your husband with (presumably) stronger/stiffer grip might have been able to channel more of the available recoil back into the slide for better cycling.