Sudden error code 5:11:3:159:101
Here’s the explanation for that particular code:
Network issue. Failing to get connected to Guild Wars 2 may be caused by the routeur or by a network server failure. If the problem remains, please contact the online assistance.
You can look into your router, and/or contact your ISP.
If you continue to have issue, you can contact the Tech CS Team via the ‘Support’ link above/below.
Good luck.