So, here is my solution after about 6 months of semi-troubleshooting. My initial setup below Fios ONT => Deco m9 Plus - router mode (basement) Mesh connected Deco m5 (basement) Mesh connected Deco m9...

Ok. I thought I was the only one having wifi performance issues. I too have a M9 Plus setup with 3 units. Each unit located in basement, main floor, and 2nd floor. I thought because my house was old,...