Update , now it works. After a night in its box, and after I swapped powerline units around ( all TP link, all equal capability) it works. I didn't change its cable.. I don't understand what made the...

@Sunshine Thanks. It's in access point mode. And the cable has been transmitting plenty high enough speeds pre X10. Indeed for a very short time the unit works well. It then deteriorates, cutting the...

Just to add: it's Ethernet from the router. Which is a way away, hence the need for a new Wi-Fi ssid facility to cover what the router cannot.

It's a terrible access point because it slows down the Wi-Fi speed just a short time after each reboot, until you need to reboot it again. I suggest someone looks into this. The set up is an Ethernet...