Just as the topic says. Sometimes you'll end up in a round where one or two bots have rifle-mounted grenade launchers, and they'll
a) never, ever miss and
b) barrage you with as many rounds as they're carrying.
I get that it's realistic, because you're damn right if it was me I'd be spamming those grenades too, but they're wiping entire teams with one bot who just plain doesn't fire unless it's a kill. This wasn't an issue in the alpha so I imagine that a value got tweaked for the beta that had this effect.