STOP LAYING DOWN CLAYMORES AND NOT USING THEM EVERY ROUND. Or using a bunch of ballistic knives and not picking them up! I'm guessing you're doing the claymore stock up trick. Don't do it!!! I use to do that too, just in case I ran out of ammo, I've got an enormous amount of claymores to use later on. But every time I'd hit round 25-27, me and my teammates would get kicked. The servers think that you're glitching or cheating and boots everyone from the game. Don't do it, and you should be fine. I'm guessing there was a patch to stop players from exploiting the loop hole.