@Christoffer_L As a workaround, you can configure Deco to reboot weekly, if you have that option in Deco app: How to configure the Reboot Schedule feature on the Deco

@SpaceMonkey Try this: when Deco mesh is up and running, change it to AP mode and see if it makes Deco mesh stable: Switching a Deco to Access Point (AP) Mode In AP mode Main Deco should be treated...

@carmon When you have single Deco unit it is called Main Deco in TP-Link terminology. Main Deco must have wired (Ethernet) connection to modem/router. What you want is not possible to achieve with...

@KevinComo Right, and I am using same type of switch, just 8-ports: TL-SG108S-M2. Works just fine with my Deco X50-POE. In fact, my Deco didn't like gigabit switch I had previously with my M5/M9 Plus...

@DoH I suggest you try what I proposed, for troubleshooting purposes. If my proposed configuration works, we can discuss next steps. If it does not work either, that may point at issue with Ethernet...

@DoH Change order of Deco to the following and see if that fixes the issue: Deco 1 (Main) – BE25 Deco 2 – BE25 (Ethernet to Deco 1) Deco 3 – M9 Plus (Ethernet to Deco 2) Deco 4 – M5 (Ethernet to Deco...