Datacentre has notified me of the following:

We are having reports that some servers are locking up. We are currently investigating this issues. There is no current ETA on resolving this issue

and then:

Upon closer inspection for the pervious issue we do not believe that we will be able to resolve the issue without a reboot. As such we are performing an emergency reboot of the gateway at 10:15am. Services should be restored within 30 minutes