Yes, I've rebooted the modem and router multiple times, gone into the router page and checked things, and finally called Comcast. They couldn't reboot it from their end so I get to wait for the cable guy tomorrow.
I could've saved myself all the rebooting if I'd just turned on the TV. It's conveniently displaying a giant message that says 'A problem with your connection has been detected. Please call Comcast'.
