I will make my own post on this but same happened consistently to me in WvW and large fights in PVE, I had to turn down sound quality to stop it.
It happened again to me a few times last night, not a big fight, but it was brief pauses, it would do the sound distort for a second or two and the game would freeze, then it would play ok for 3-4 seconds then do it again. The odd part, A bunch of my text changed to chinese when this happened. Have to youtube the video of it today.