@Nightfly With the help from an engineer from TP link we established the problem was being caused by sky Q box connecting via wifi to deco, the sky router on but wifi turned off. In my case I was...

@TP-Link Sky router model ER115.

My 3 Deco M9 plus units work in router mode and are connected to a sky Q router. If I switch to AP mode after it reboots I get internet connection, solid green light and the devices get their new...