Hi sAnexeh, thanks for sharing. If all your deco units are connected via Ethernet cable. Can you draw draw a network map? Here are some connections which may not good for the deco:

As I know, all the deco units will share the same SSID&password and act as a whole wifi system. Can you share a screenshot of the seperate networks within the app?

It's quite interesting. I wonder if all of the devices that connected via LAN to the powerline adapter have the same issue? Could it be a specific model/brand of the Ethernet card that cause the...

Reboot will wipe out the messages? If it does, your suggestion is good

Hi guys, try this beta http://static.tp-link.com/resources/software/mr3420v3_eu_3_16_9_up_boot(160517).zip

That largely depends on your computer device. Some computers or phones will only display one network if more than one network has the same name. And usually it will show the signal strength of each...