@Alexandre. thanks again for your thoughts on this. And it's good to know that you are running your Deco mesh successfully in Access Point mode and are all wired. That does help reduce the possible...

@Alexandre. thanks for the thorough reply. I really appreciate you getting through my long post with all the info. All of my Deco are wired. I don't have any that are getting their signal from...

I've got 3 M5 Deco units spread out through the house. It's been in place for a little over a year now. My 5 Ghz WiFi coverage is good with a minimum of 1 out of 3 signal in most places in the house....