Guild Wars 2

Okay, so for the past couple of months now, my Macbook Pro has been making odd popping noises when entering and exiting the game. I typically ignore them, thinking nothing of them until the sound shuts off on my computer entirely. When this happens, i usually restart my computer and everything is fine again.
Everything was fine until i clicked out of my last session, and my computer made a loud, high pitched, buzzing noise, as if something had been stuck in an electrical socket. Anyone have any clue as to what’s happening?

My mac has had the audio cut out randomly, I know its just gw2 because I can still hear the popping noise for the audio going up and down when I turn it up and down.