what mother board do you use?
i know it sounds strange but chankast seems to over heat a chip on motherboards that's called the "south bridge"
if you take the side off your case and see if there's a fan or heat sink on it, (you might have to visit the board manufacture to see where the south bridge is, but i doubt it has any heat sink or fan)
as my south bridge chip was hot enough to burn my finger when running chankast and soul cal, and after adding a heat-sink to it, i don't suffer any sound loss now
or if you have a house fan, take the side off of your case and have the fan blowing cold air into it, then try it