I have a Dell Studio 1557 with IDT drivers. I have it configured to enhance sound with SRS effects. I've noticed they turn on and off on their own, suddenly it starts sounding then it stops. Especially when no sound is being played after a while, effects are off, then you start using some sound intensive application such as TV or music and bass and srs effects get in after a few seconds.

Is this behaviour normal, how can I prevent it from happening? I want full bass and sound effects all the time... otherwise it is quite mediocre...

Thanks