@Pharoahe9 I am assuming you have Main Deco M5 and two or more Satellite Deco M5, correct? If this is the case, one simple test you can do is take problematic Satellite M5 and swap places with...

@drazgo Activate guest network isolation, wait for about 5-10 minutes, then check if you have access to LAN from Guest (you shouldn't). When I tested that on my Deco mesh with M9s, I have found Deco...

@paulpoelstra You can use Deco Guest Network to have 2.4GHz-only WiFi under different SSID.

@Claire157 Do you still have your Deco M5 units, and Deco M5 mesh in your Deco app?

@IgorFkx Roaming works just fine with my Deco M9 and M5 mesh. I can have Android 9 smartphone or Surface Pro tablet connected to Satellite Deco M5, make device stream YouTube video in 4K, walk...

@DukeCaboom >The TP-Link Deco units only have two network ports for physical connection. If you need more ports, get simple unmanaged gigabit switch, preferably from TP-Link, connect it to one of...