Hello, I have also had this issue twice since shadowbringers patch 5.0, both times during instanced battle content (lakeland msq instance laxan loft one, and titania battle), I have the same sound configuration.

(Random crash: xaudio2_9.DLL)

SYSTEM_SOUND Headphones (Realtek High Definition Audio)
SYSTEM_SOUND_DEVICE_ID {503B3C23-DCAB-4A30-AA54-9482254A9D5E}
SYSTEM_SOUND_DEVICE_NAME RTKVHD64.sys
SYSTEM_SOUND_DRIVER_VERSION 6.00.0001.8158
SYSTEM_SOUND_DRIVER_LANGUAGE English
SYSTEM_SOUND_DRIVER_DATE 5/16/2017 00:00:00