A potential issue has been found and corrected. We hope that this matter now will resolve itself for almost everyone within 24 hours.
EDIT: We have actually found two issues.
The one we found first pretty much has been blocking many users from getting updates.
The second we found makes it take longer time to update the data. Our updates are most often fairly fast, but we have lost some (data)-cached data and for some users it's therefore taking more time than normal. They are then partly blocking others.
Project-GC is working on correcting this as fast as it possibly can.