My sound keeps scrambling and blaring without warning before I either restart or stop music/videos for a while. It's without warning and happening on different programs. Is this happening to anyone else?

My sound keeps scrambling and blaring without warning before I either restart or stop music/videos for a while. It's without warning and happening on different programs. Is this happening to anyone else?
I thought about resetting the nvram/pram, but before I do that, I wanted to check here. It might not be the issue. My startup looks fine and the sound is great up until the discrete moment when it's suddenly scrambled and nonsense.

I did try a safe boot once before, which didn't stop the occurrences. I can try it again to make sure, and see if the problem stops happening.
Never installed extra audio or plug-ins, though.
It happened just once not long after I bought the mid-2013 MBA, which I think came with 10.8.4, but I assumed the noise was because I was moving the computer around on a surface that created static, since the noise stopped after I picked it up off the surface. However, that must have just been a coincidence, because it happens more frequently now without moving or touching anything.
Trying the safe-mode boot and restart, and testing it out for day or so to see if it happens again.

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