Yes, we were off the air for a couple hours. Modem seemed to be having trouble connecting to both of the pair bonded connections at the same time. Then it self-healed before I managed to get through to a human at CenturyLink. So, buh.
Since I have no idea what the problem was, this could recur. (Road People have been doing work on Island Crest Way all month, though if they sliced through something, I'm guessing we'd get a more long-term-variety error...)