@Plebo2000 Nothing beats the actual test of signal strength. If you have good WiFi signal at the future location on 3rd Unit, coming from the 2nd Unit, the changes are good Deco mesh will be working...

@Aeron There are no configuration settings in Deco to force it use gigabit, just like there won't be in a generic 1000/100/10 switch. It is a good idea to try to mitigate problem by using networking...

@Aeron You have proved this is not defective Deco unit problem. I still suspect issues with Ethernet cables. Set your current Dining Room Deco as Main Deco in Deco app. That will make your network...

@Aeron "The Deco in the Living room works perfectly and I don't ever experiece any problems with that one as that one is connected to the Sky Q and deals with streaming 4K content and never buffers....

@kukku If you only use Deco mesh to deliver strong WiFi signal through you house, consider running it in Access Point mode. That will unlock maximum possible WiFi performance you could get from it....

Aeron wrote ... My upstairs bedroom Deco is connected through Ethernet to my PC. What would happen is my upstairs Deco will register to my PC as my network name 2.4Ghz which is my Guest network. ......