We're really sorry for the inconvenience! We've been scratching our heads at this problem through the night and some of us haven't had any sleep for over 30 hours!
The good news is that we think we've found the root cause, and we expect service to ramp back up to full capacity soon.
Once we verify that the issue is fully resolved, we will post a detailed write-up about the issue.
Thanks again for being patient with us!