Defective Deco M5?
I'm getting "good" signal strength when I put my smartphone and laptop next to my Deco M5. If I move back 3 feet, it goes down to "poor" and a dead zone by 6 feet. That's on 2.4Ghz. Turn off 2.4 and force it to connect to 5Ghz. The signal strength is almost nonexistent. Mind you; I have the Deco in clear sign with no possible obstruction or interference.
I've just received this unit from the mail today, and I wanted to see if I was doing anything wrong before I try and return the unit. If it helps, I live in a condo unit with dozens of neighbors all beaming their WiFi.