Yes me too.

I tried ditching the prefs and Apple's disk utility. Still the same. It seems
more stable for a while after doing this and then off it goes. Certain things
trigger it off too like: zooming out of the stage using command -. also
scrolling along timeline and picking a sprite from there to edit behaviours.
There's no special things with this project either. I've tried other G5s and
still the same. Are you running 10.3.3? As this never happened before I updated
my OS. I use Illustrator 10 also and this does the same sometimes. Very
frustrating like you say. Anyone else having the same trouble??

Leigh