Mesh tp-link, fail to connect over eathernet cable

Server Version#: latest
Player Version#: latest
I just got a tp-link X10 3 node mesh to replace my ASUS router.
All works fine when connected to Wi-Fi.
But when I am connecting the PC ,with the Plex server, via eathernet cable to mother-mesh, my appleTV and web-OS says that my Plex server is unavailable.
Unplugging eathernet (going back to Wi-Fi from PC to mother-mesh), all goes back to working.
Any ideas why this happens?

Reason for using eathernet cable connection is that I assume that bandwith with cable will be better.

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