The issue was resolved within 3 minutes. The cause was the rebooting of multiple servers at the same time, whilst only 1 server should have been rebooted. This was an oversight in our standard operating procedures. We are investigating ways to automatically protect and prevent this from recurring.

For a 3 minute period between 09:29 and 09:32 UTC, some requests were not returned. This issue affected only certain requests and only certain accounts. Most accounts were unaffected.