Let's take a break for a moment as we will have a Scheduled Server Maintenance on November 4, 2015 00:00 PST.
Below are the inclusions for this maintenance:
Trial EX: Imperial Ambition
Preparation for Anniversary Login Campaign
News Page Update
Make sure to complete all your tasks and refrain from logging in during the maintenance to avoid any game account related concerns.
For more details regarding the maintenance, you can check out our Official Announcement.