Guild Wars 2

So we were just finishing up Jormag’s claw, when suddenly during one of Jormag’s roars, this sound came… As the noob I am I though this was just an “ear drums popping” effect put into the game. I was quickly proven wrong when the game suddenly crashed… I started it up again (luckily, Jormag was still there…) then I continued in the same spot, hitting him and what not. Then again, during one of his roars, this… This time the game did not crash and i took time to record..

Here is the video I got (same description)

Had it before as well. Had to restart my PC to get rid of it.
Wonder why Anet hasn’t included a disable sound option entirely from the game instead of relying on turning volume down.