OK... I'm having a really really weird connection problem. Tonight in 25 ICC, it seemed as if whenever the guild was out of combat, my connection was fine. Literally, as soon as the tank runs in to pull Putricide, I lag and DC within 10 seconds. I have all my settings on low and I know that my computer can run fine. It's severely pissing me off to the point where I had to leave my raid cause I was causing too many problems.
Try disabling them (or some, like things you don't need) and see if that helps out at all. Also, have you done the raid before? It could be that this new content slows you down a bit.