Issue with Sky Fibre and Deco X60

[NSyl]

I have been using 3 Deco X60 nodes to give me mesh WiFi connected to Sky Fibre router in access point mode for several years now and have hereto had no issues. Suddenly today it has stopped working. The deco WiFi network is fine, but the main node can no longer access internet via the router ( connected with Ethernet). I have been pulling my hair out all day trying to resolve ( multiple reboots, changed out the Ethernet cable etc). But no luck. Does anyone have any suggestions?

[jamesn123]

@NSyl 

Does another device connect fine via ethernet?

[NSyl]

I'm not sure. I don't have another device with an Ethernet connection (everything these days is wireless!). But for some resaon the Deco finally started working last night, although I don't know what I did to fix it!