My set up is as picture above.

Main Deco BE65 refuse to connect to Internet after normal reboot, after reboot main Deco BE65 is showing red light and stays there. It fails 100% of the times I've tried to reboot. 

I have found a workaround, but I refuse to have a solution that won't work properly.
 

This is how I solve the problem today.

First step, I disconnect the network cable from the main Deco that is connected to a TP-Link network switch. This network cable is the connection to the network switch, that is feeding the cable backhaul connection to the two other Deco's.

After I have disconnected networkcable, I disconnect the power cable on the main Deco, then reconnect power, the main Deco reboots and starts up again,  showing green light. (this connection is also confirmed up and running with ok in the Deco app).
 

Second step, I reconnect the network cables feeding backhaul the two other Deco BE65 via the network switch, then everything reconnects and up and running perfect....this hack works every time. Full speed no IP conflict or other problems.
 

My set up, is exactly as picture above. Deco BE65 in set in default WIFI router mode. Main Deco BE65 is connected directly into ISP modem, default settings on everything. All is based upon cable Cat6 backhaul solution. 
 

I am using a TP Switch TL-SG108 8 port after main Deco, and the two other BE65 is then connected to this switch. I have also activated Guest WIFI.

So as you understand I am not particularly impressed with the DecoBE65 software

any tips?