I just got a AX90 router and I was trying to set it up, but for the life of me I can't get it to connect to my modem (Arris SB6183). My old Archer A7 still connects just fine but which I plug the mode

I had bought a Archer A7 February of 2022 and for the most part I have been happy with it. But over the past several months I've began to notice that the range has been slowly dropping. My workspace i