Hello, This is the RO1 Studio Zero Team.
We would like to inform you about the 
Mjolnir server connection instability issue that has occurred since the regular maintenance on December 7th.
In order to provide a stable Ragnarok Online: Zero service, internal structural improvements were made, and this content was applied to the Sakray server on October 24th for testing purposes.
However, after the update on December 7th, an issue occurred on the Mjolnir server for which the cause could not be identified,
and we are currently working on identifying the cause and making corrections.
We apologize for the delay in the announcement and fix, as the cause has been difficult to pinpoint.
We sincerely apologize once again for any concern this may have caused, and we will strive to provide an even more stable service going forward.
If there is anything further that needs to be communicated, we will inform you through additional notices.