Sometimes my sound goes low and then comes back up to the normal volume when I am listening to music, watching a show, or watching something on youtube. I'm not sure what is causing it and the online chat person couldn't figure it out. She when into my speaker setup and enabled all the optional speakers (center, subwoofer, rear pair) and then under "full range speakers" she enabled "front left and right" and also "surround speakers" but that didn't help. Any solutions for this?
HP H9-1400t system
windows 8.1