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Part of the connectivity issues from the other day were DNS related so it's possible locally saved DNS records can still cause connectivity issues.
If you're still seeing an issue, reboot your router and flush the DNS cache on all your computers.
Edit: I haven't read any of the other posts in this thread, so if this suggestion has already been made I apologize in advance.
I just ran across this thread and I have the same problems with connectivity as of 5pm tonight. It started last night and has lasted all day today.
Tech support tested my fios connection and said everything was fine, but it isn't. I tried flushing my cache, but it did nothing.
I guess it is a waiting game now.