Whatever it is, I'm leaning toward Comcast or a bad network line somewhere because it's not just misbehaving with FFXIV, it was even interfering with a couple games on my phone earlier today. I'm in Tennessee though. I've been randomly getting a series of nasty lag spikes to the point of R0s and warping of people/me/mobs going on and then everything is fine for a little while before it all goes back down the toilet again.