Hey guys. Okay so here's the problem. I dled steam a while back, bought left 4 dead 2 and played it without any problems for about a month. All of a sudden within the past few weeks it goes through the same pattern of lag. What will happen is..I'll play the game online and it'll be perfect for 15-20 minutes. Sometimes more, sometimes less. And then for no apparent reason it'll start to lag. At first usually not so bad..it'll just go slow motion a bit for a minute, then stop for a few minutes. Then go again. It just repeats endlessly and over the course of 15 minutes or so it gets to the point of unplayable. I have no explanation what so ever why this happens, or how it always goes in this same pattern of going slow-mo for a few minutes then stopping, then repeating. Any help would be awesome, it's at the point I don't even want to play anymore which really sucks. Thanks.