This bug happened during Iron Banner, twice to me personally, once to a friend. I haven't had it happen since, but am reporting anyway. My Vex started acting like a secondary fusion rifle, taking time to charge before firing. Once it did fire, it fired in full auto- however, the ammo cap was something like 12 rounds and the total was only 35. Going to my menu and switching primary weapons, then switching back to the Vex, fixed it in every case where this bug happened, but it was annoying nevertheless and it cost us both a few deaths in competition (I believe it cost us at least 1 match as well, as a result). Please fix!