I've noticed some really weird blips with ISPs in general in the past several months. Nothing I can pin down, but my working knowledge is incredibly low, so I don't know the tools. For instance, I run a Mumble server on a Linode, nothing special, and last night, all of my SF/BayArea friends had a storm of disconnect-reconnects. I didn't have time to diagnose at the time, but I doubt I would have found anything either.