Its an old thread, but i have this problem.
I can play any online game without problems, but when i play guildwars2 it keeps disconnecting my entire computer from the internet.
Ive been experiencing this problem for 1 or 2 weeks now and i can play for a while, then i get a message that i got disconnected from the server and when i check my entire internet went down.
ISP: Ziggo
Location: NL
Server: FoW