sound bug during start of some games

Thanks for great product which is inferno-sound is beautiful.
Despite that I found one bug: when I start game (seldom battlefield 2 but more often trackmania nations forever) just after start of the game appears very high and very loud noise. Usually after 3-4 seconds of this noise the whole computer is restarting. Because I play often trackmania so (on the basis of this game) such behavior I meet 1/5 of starts of the game.
Can you send this info to cmedia to solve this problem?
(asus p5 b deluxe- built -in sound off, gforce 7900 gt, 2 gb ram, 320 gb hard drive, sondigo inferno, windows xp prof sp3 PL).