Both my roommate's and my PC's randomly experience lag when we are doing things like watching a DVD or playing a game. My PC is older, but my roommate's PC is brand new. His laptop also does this, but never did before we moved into this house. We think it could be an issue with our network, because when we did not have a router for a few days, we did not experience this random lag at all. Has anyone ever heard of this and what can we do to fix it? Thanks