@ErnstSl Thanks for coming back and telling how mystery was solved. Out of all probable causes that one was least expected.

@vetgat It appears when your Main Deco connected to the fiber, gigabit networking switch loses its Ethernet link to Main Deco. I can't explain why it is happening, but symptoms match. See this for...

@Andwit You can do that. You can also connect devices to both Ethernet ports of Satellite Deco.

@JMNathan At my house I use Deco mesh to provide WiFi coverage, it runs in Access Point mode. Parental controls are set on my ISP router. This is unfortunate flaw in Deco parental control design:...

@JMNathan To force Sky router Parental Control on devices connected to Deco mesh you will need to configure Deco mesh run in Access point mode: Switching a Deco to Access Point (AP) Mode

@KaanT What if you start Netflix app when TV is connected through hotspot, keep app open, shutdown hotspot forcing TV connect to Deco mesh - then run Netflix troubleshooting from the opened app....