The latest LostCousins newsletter says that Ancestry plans to delete all matches less than 8cM in order to remove false ones.
And insodoing, they'll be clearing off thousands of accurate matches. Instead of tinkering with something that isn't broken, why doesn't Ancestry offer something useful like removing the 20cM cut-off or a chromosome browser? What with this, and deleting all messages and folders with their new Messaging system (you have until 31st August to download these), I'm getting a bit hacked off with Ancestry and their 'customer service'.
Peter Calver at LostCousins says there are three ways to protect matches <8cM: add them to a group, add a note to them, send them a message (which is about to be deleted by the new Messaging system so not sure how this will work).
For more info, best see the LostCousins website.
Edit Five of my common ancestors are <8cM; nearly 500 are in groups (thankfully); and more have a manual connection. Can't count the ones with notes, but there are lots. How can Ancestry say these matches are false and, therefore, worthless? I wouldn't have been able to make connections without many of them.