@zonian I found out how the DECO should be connected to a lan cable and not to the other DECO's wi-fi. When adding the DECO to the network , the lan cable must be connected all the time.

@Shafiul_1112 I have similar issue. And I did everything within my power , but with no result. I have 2 X E4 routers. one is in my living room and is working fine, the other is 50 meters away. Both...