We've posted a follow-up regarding the errors being experienced:

Quote Originally Posted by NOC_NA View Post
[NA] Regarding the Instance-Related Issues (Aug. 24): Follow-up

Regarding the issue wherein players are unable to access instances, we are continuing to investigate and conduct the recovery options.

Please be patient while we continue to finalize the time frame of the maintenance.

We sincerely apologize for any inconvenience this may cause.