AX5000 doesnt appear on the Model list, however, I have verified that it is correct on the box. Purchased at Costco.

1) All of my devices but one connect to my correct network. 

For some ungodly reason, my Dell laptop cannot see my normal network. I've set it up time and again, forgotten and recreated the network in my PC, all to no avail. It has been the same network forever, I recreated it after I got the Decos up.  Out of a 3 piece set, I only have 2. I really need my PC, obviously. I've tried isolating the networks, turning off the 5 ghz band and trying to connect my PC to the 2.4ghz band, then later the 5 band, no dice on either. Ive uninstalled and reinstalled the Wireless adapter. I checked the Deco's wifi Diagnostics for the network on my iphone app, and its showing 5 stars, 

2) I live in a 750 sq ft apartment, yet my wifi drops constantly when I'm using my little Chromebook in my bedroom. I have to reset my modem over and over and i didn't have this problem previously. Maybe unrelated, problem #1 is the priority.

What should I do to get my Dell to be able to find my network? I didn't have this problem with my old Nighthawk.