Ok so every so often during some of the more epic events such as fighting world bosses, in the middle of the fight the normal audio will cut out and will be replaced with this strange pulsating tone. it fades in and out and kind of sounds like some sort of alarm or maybe even similar to a binaural beat if anyone out there knows what im talking about. anyway its really strange and quite annoying and when it happens the only way to fix it is to log completely out of the game. Another weird thing is when the in-game audio gets cut and this strange sound starts i can hear it outside of the game too. even with the game alt-tabbed i can still hear it, and again the only way to stop it is to log out of the game. Simply minimizing the game doesn’t stop this annoying ringing sound. if anyone else has dealt with this before please help!
Second, your description fits with some of the sound bugs