Same problem here in Brazil. When I started playing GW2 a few weeks ago I’ve noticed some randon connection losts while playing but now it seems the game is causing my internet connection to go down entirely. Also, I need to restart the game client and log on again. I will take note of the crash code and edit this post next time.
Edit: it just happend again. Got 2 codes: 7:11:3:189:101 and 42:1000:7006:852:101
Edit2 (12/15/2012): The problem was my router. It is fixed now and working 100%. Guys, try to set the lease time on your router’s DHCP. In my case it was too short and every time my D-Link renewed it I lost connection with the game server.