Well, just to add one more to this issue.
I play from Brazil on America region on Sea of Sorrows server and I’m also having these disconnects for a few weeks now. It is impossible to play. Another friend that lives here is having the same problem on his PC. Hours of play or a few mins and BAM, error 7:11:3:191:101 on your face. Totally random.
Everything is working fine with our router and ISP. All ports used by GW2 are open and no firewall in place.
This gotta be on A-net end.