The audio stuttering became more frequent since patch 6.01, it's especially bad when playing as Dancer or Reaper.

Another problem that wasn't fixed at all for me is random pops of the "crowd chatter" ambience sound that you usually hear in the starting cities. I hear them everywhere, even when I'm completely alone. This also means that I don't hear the normal soundeffect while being in a city. Sometimes these pops last longer, that's the reason why I was able to hear where it is coming from. Turning off the ambience stops it.