We’re experiencing problems with our servers. The problems appear to be upstream from us, in either Linode or Amazon S3. We’ve let them know - they are working on it.
Since it does not appear to be something on our own servers, there isn’t much we can do about it for now.
Some jobs are getting through, so it looks like it’s ok to keep trying.
We are monitoring the situation and hope they can resolve the problem soon. We’re sorry for the disruption.