Hi, I bought a Deco M4 2 units pack few days ago and while it´s allowing me to reach the "shadow zones" of my apartment, it´s not going as expected in terms of speed. My ISP is providing me with a 600

I have 2 Pack Deco M4 and I'm experiencing slow speed on 2nd unit. My modem and the Main deco have the same speed of 50 Mbps but when I'm connected to 2nd unit, I'm only getting less than 1 Mbps speed