Happens to me anytime i’m close to a large scale battle be it WvWvW or one of the dragon events. Sound is gone and replaced with that unbearable repeating tone. When not in WvWvW my game will crash seconds after this bug begins. Seeing as I can mute GW2 when this occurs and all other sounds be it from streaming videos or w/e else still work fine it definitly isn’t my sound card.