I've been getting the same problem, as soon as I start combat on, say a training dummy, the sound starts to stutter REALLY bad, and it's everything: sound effects, music, my character's voice.

Something I found odd was while I've been using the training dummies in Stilltide, if I go to their rear and have my camera face forward, the stuttering happens without fail, but if I turn the camera around to face their side towards the cliff, it tends to get better and sometimes even stop.

So far I've tried:

-Switching to DX9
-Default audio to 16-bit at 44100
-re-checking all the game files
-updating whatever drivers I had to update
-lowering numerous graphical settings to the lowest

Nothing has worked for me so far. The game was working totally fine on Tuesday, so there has to be -something- that the devs can do to fix it. Or at least I hope. I honestly can't play with this godawful noise, and I've been waiting for this expansion for a long time now!