Hello im Currently having a problem with Ethernet connection through the Decos

My connections are like this

Router-->Ethernet connection-> Deco1----Wireless Connection-> Deco2

Wifi is at its finest! Had no problem at all 

BUT when im taking an Ethernet Cable and Plug in Deco1 to Connect my Laptop/Desktop I'm Getting Disconnected and reconnected like 3-5 times per minute

Internet still works from WiFi

Deco does not change any Lights stays at White

When I plug the Ethernet on my Router again its fine and no disconnects 

Tried Both Router Mode and AP Mode. Any Kind of Help would be Great!

Thanks in Advance