Hello 

I am not sure if my hardware version out I purchased these this week from amazon. I have the 3 Unit setup.

Here is my network. 
-Cable Modem -gigabit speed isp is spectrum

-Hard Wired via gigabit Ethernet cable to port 1 of main Deco M4, 

- Port 2 of main Deco is hard wired to port 1 of TP-Link 5 port gigabit switch. 
- I have 2 home runs HARD Wired cat5e to the other 2 Deco M4 units. 
 

problem

so I uae to enjoy 600-800 Mbps close to my WiFi router, but not in my entire house. First I tried via the wireless mesh network and that was only 50-100Mbps. 
 

with only one Deco (router no satellite units connected my bandwidth is around 500Mbps, as soon as I connected the the other units my bandwidth across the entire network drops to below 200 Mbps. 
 

I have re puunced the patches and jacks, swapped network cables, turned on QOS. 
 

does anyone have a fix for the above? I like the units but will have to return soon if I can not get this fixed.