It seems as though I only get a few tactical battles in before my "Action" audio totally drops out for them. I still get music, just not the sword strikes, spell effects, and walking sounds. I would really like to hear my opponents get torched.
I run Win 7-64, and have a Creative Labs Soundblaster audio card from the X-Fi line. I have PLENTY of Ram, 2.8 Quad CPU, and 1 TB Storage, so none of those things should be a problem.