A quick update. Before I swapped the unit again I phoned WD support. They suggested resetting and re-syncing which I had done to my hearts content with no success. The guy was as helpful as he could be I guess but he did say the main problem he sees is with the plc-link not working.
Anyway I have sent it back to Amazon and ordered a new set and should come tomorrow.
As an aside I found my router had a problem such that it wasn’t allocating IP addresses properly, my network printer was affected. I fixed that by resetting the router and the printer then picked up the correct IP address. I didn’t think this would affect the livewires as they are switches as far as I know and don’t have an impact on IP addresses. By the way both of my boxes lost their network connection.
When I’ve tried the new boxes, if the plc link drops out again I’ll try resetting my router to see if that fixes the problem.
