It appears since the last firmware update, the issue described has developed.
My Time Machine backups stopped and I couldn’t work out why, until I tried to reselect the MBLD in the TM prefs. It wasn’t in the list.
In Finder, under Network, the entry reads ‘mybookliveduo’ instead of ‘MyBookLiveDuo’.
I’ve also just installed a new Netgear D6200 Modem Router but I don’t think that’s part of the issue.