I've actually had Internet issues over the last few days as well.
Comcast is my provider, and the issues are not limited to DNS server issues, though technically I'm running my own caching DNS server that queries the ISP/root servers so that should be something I'm insulated from anyway...
However I've been getting more frequent service outages (like they're restarting the network routers on some kind of emergency or at least unplanned basis). It's one of the higher items on my list to do today, tweaking and rebuilding my firewall rules to make it easier for me to diagnose this...