On Tuesday, January 6th, our Cloud Engineering team will be upgrading Ceph, the software powering DreamObjects, to the most recent release. Throughout the upgrade window you're likely to see intermittent connectivity issues. Your data is safe and will not be affected.
Follow the progress on the upgrade on the DreamHost status blog.
UPDATE: The team successfully completed the upgrade. They'll continue monitoring the cluster for stability and we'll report any issues if they happen. Thanks for your patience!