I am still getting disconnected, but it does it less often... any advices?

Well, I did flash the new firmware again but this time, manually using the http://tplinkdeco.net/ page. It seems to have fixed my connection stability, so far so good. Let's hope it stays like that!

Here's some log : Mon Nov 23 13:50:16 2020 daemon.err client_mgmt: client(xxx) not found in arp table disconnect_counter=0 Mon Nov 23 13:50:34 2020 daemon.err client_mgmt: client(xxx) not found in...

Since I've updated yesterday, my wired PC is getting disconnected from my LAN. It was fine and stable before the update. Did reboot / restart everything, but I am still getting disconnected: WiFi...

@BigE0n it's under IPv4 menu ->

Well, it seems that some of my network cables were not all CAT5-E ! But I swear, it was working for weeks before... so, I swapped some CAT5 cables for some new CAT5-E and voila... these tp-link...