@Tony thanks for the suggestion. I just tried that but it did not make any difference. One thing that did help was locating the Deco higher up. I am limited with how high I can put it, but even just...

I have just bought a two pack of Deco M4. They are plugged in to one of the LAN ports on my modem/router. Testing on my laptops show speeds of 85Mpbs which I am happy with, but phones on Android and...