Hey, I bought a Archer a7 router like a week ago and throughout the entire day it will drop connection for a couple minutes on all my devices. It is connected to my modem with a ethernet cable, I already contacted my ISP and the modem is working on their end. When the internet cuts out, the modem is on while the archer a7 is disconneted.

I already have tried different ports, different ethernet cords and even tried opening my dns. 

Idk if its the firmware or what, any suggestion would help