Just to add my voice: experienced the same right now - same repository was working fine yesterday (about 12 hours ago). Is this perhaps related to planned maintenance / downtime scheduled for this weekend?
Firstly, we apologize for the delayed response. Over the weekend we had a known issue with storage, however no data has been lost. Normally this would be handled automatically but due to unforeseen circumstances it was not. This issue should now be fixed. If you have any further problems relating to this, please feel free to contact email@example.com.
We have an automated system which deals with this which does its best to rebalance repositories between our storage nodes. It still appears to be working (I've confirmed this with our ops team). Most issues like this should clear up 15 to 30 minutes after seeing the error. If it lasts longer than that, I strongly urge you to open a support ticket by emailing firstname.lastname@example.org as we do not actively monitor issues which have already been closed.