Spoke too soon
In order to address an issue where sound effects are delayed, we will be performing emergency maintenance on all Worlds at the time below, during which FINAL FANTASY XIV will be unavailable.

We apologize for any inconvenience this may cause, and we thank you for your understanding.

[Date & Time]
May 27, 2018 11:00 p.m. to May 28, 2018 3:00 a.m. (PDT)
* Completion time is subject to change.

[Affected Worlds]
All Worlds
So here comes the client update.