running into similar problems myself, but i think it's been happening since before 3.3. ran VH the other day and all three of my slaves froze up mid boss fight. finally unfroze after the boss was taken down by the tank/me/and i think the pets didn't freezeup. but the hunters wouldn't shoot. happens at different intervals, but usually just one or two at a time. and like BC here, my addons are all up to date, more than enough room on the HDD and even defragged last week before I ran this.