@TECreasey You definitely proved it is not NAS that has a problem. You have multiple devices connected to both Deco ports reporting disconnect and reconnect. So, it must be Deco node. If not for...

@Ken12 I would suggest not to mix different generations of Deco devices in one mesh: WiFi 5 M-series and WiFi 6 X-series. It is my personal opinion, of course. I like M9 for dedicated 5GHz backhaul,...

@TECreasey If you are still getting disconnect alerts after you disabled hibernate, enable it back. It is the one that extends life of your NAS hard drives. It is even set too generously: if nobody...

@manamaga You still haven't said if your run your Deco mesh in Router or on Access Point mode. If it is Router mode, this should work with the switch back in the picture: That can also work in AP...

@manamaga I used diagram you made and edited it. Changelog: 1. Removed Unmanaged Desktop switch; 2. Connected Main Deco to Virgin Hub and to Powerline Adapter Downstairs, utilizing both Main Deco...

@manamaga My two cents. What you have can work, but only if you run Deco in Access Point mode. Even then, this network diagram can be improved and simplified. Each Deco has two Ethernet ports, think...