Sorry about the brief interruption to service. One of our data centres was performing router upgrades. In theory (and it's always a theory until tested) traffic should have been any cast between the redundant routers at the data centre and there should have been no impact on service. Alas that appears to not have been the case. We've not had the "hands off" yet, so there may be some further interruptions. The full maintenance period finishes at 0400 UTC. Obviously once the dust has settled we'll ensure the data centre resolves the any cast issue.