Bad connections. It's too bad the matchmaking system doesn't match up red-bar players with only 11 other red-bar players. Seriously, fix your connection. And if you're using one of those shitty Technicolor all-in-one cable modem/router thingies, take it out back and office space it. I'll even lend you my whupass stick to do it. If I'm playing PvP without friends, and I can't open ammo boxes or walk through a door because it takes a minute for it to open, I'll leave the match, even if my connection bar is green (if it isn't, it's time to reset everything). It's just not worth my time.