A further interesting development! When I was looking through at the loading on each of the LAN ports on my BTHomeHub 5 router as a result of all this, I noticed that a number of my neighbours...

The same thing happened to me. I had two Tl pa8030p power adapters working so I bought two Tl pa 8010p power adapters as well and had one connected to the other three working well. Then 5 or 6 days...