NPC Dialogue Speeding up\Slowing down

Since the Ascendancy update, sometimes when talking to NPCs, the spoken dialogue (usually happens on a greeting) will either be drastically sped up or slowed down. This comes with a full blown pitch shift in the dialogue, Sometimes the dialogue speeds up, and the pitch goes really high (remember that stupid chipmunks movie?), and sometimes the dialogue slows down and the pitch along with it.

This happens rarely, but has still occurred quite a few times - enough for me to actually notice and not think I'm imagining it.

Last occurrence was just then, where Catarina's greeting was sped up really fast for the first second or so of her dialogue, then returned to normal before finishing the audio. I've never noticed a consistent trend that might be causing it (NPC, Location), aside from it almost always being a greeting.

Can post various hardware specs if required.