If the N9 is lagging or seems a bit sluggish the audio quality then degrades or becomes slightly distorted. I've noticed it while streaming over bluetooth. At first the quality is great, then after playing with the N9 a bit while it's streaming, it lags a bit and seems sluggish and the audio stutters. When it stops stuttering, the phone returns to being smooth but now the audio quality seems degraded. It doesn't return to normal unless I disconnect bluetooth, shut the music app and then redo the process over again. (It has nothing to do with the quality of the song file because quality is superb if phone is running smoothly.) Maybe one or two apps are open during streaming (music app, email and messages) so nothing intensive.
Also noticed this with headphones of any kind.

Anyone else notice this?