I managed to find a solution for the disconnect error (at least it worked for me):
I use Windows Defender as AV/firewall and for any reasons, gw2 wasn't added to the whitelist for firewall passthrough.
After i manually added the game exe (Gw2-64.exe) to the passthrough list, I got no more disconnects with Error Code 7:11:3:202:101.
Maybe it works for you too!
Detailed steps (freely translated from german, so some words may be different ^^):
open Windows Defender (e.g. doubleclick the icon in tray)
click on "firewall & network protection"
click on "allow app access through firewall"
if you can't find gw in the list, click on "change settings" on top right and then on "allow different app" on down right
"search" for gw2 path on your hdd and open Gw2-64.exe
click "type of network" down left and mark both networks
hit ok, restart gw2 and enjoy 🙂
Take care
Azradox