I have My Deco M4 connected to router (T3 T628) via Ethernet in AP mode in living room, I connect another M4 in my bedroom using Ethernet cable from the back of main Deco unit, the problem is the...

My house has lan connection running every rooms. My main Deco M4 is connected directly to modem. My bed room deco (which connected to room's land port) keeps turning red once every 10 mins (it stays...