Thanks, guys. I first noticed the problem yesterday after adding a gig switch and plugging in a few devices for my nephew's system (while also experiencing audio issues). After I finished the cabling, there was no Internet access. I spent a couple of hours troubleshooting, only to give up to watch the Cardinals game. Later, a friend called and said, "So, what's going on with Charter Internet?" He then described exactly the same symptoms as I was having earlier. I also found out that, although I was running, Internet access was unusually wonky on my own system. Good to know it wasn't anything I'd done - just an unusual coincidence. I'm going to make the change later today.