Comment 11 for bug 237443

Happens to me as well under hardy 64.
The correlation I found is with the wireless link being utilised/stopped/started etc.
Never had this problem before I started trying to connect an ipod touch my laptop's wireless card via ad-hoc mode.
Also, it's reproducible 100% (on my system at least) by unloading the iwl4965 module from the kernel: "modprobe -r iwl4965" and pulseaudio takes a dive.

Hardware is a linux-friendly xps m1530 ( bought before the official ubuntu version, but manually configured with the same hardware )