I have a mid 2010 MacBook Pro and just over the last week or so it seems that at random the video starts to lag. It's always when I'm playing Diablo, which has never been an issue in the past, but I notice that once this video lag kicks in I can't even watch youtube videos as they also lag. What I've been doing is just restarting my computer and it goes away, if only for a little while. Is there a long term problem here or something I can fix? Any help would be appreciated