... seemingly at random. Not associated with any particular program either - happens while I'm gaming, listening to music, or even browsing websites - whether they have sound or not.
Sometimes it allows you to turn it back up, and other times it gets "stuck" and automatically drags right back down after being turned up.
I'm doubting it's a sound card issue, because it happened with the onboard sound as well as with the new PCI card we installed. Drivers for chipset and card are both current, and I've checked every setting I could think of ... disabled legacy audio in the BIOS and all that jazz as well.
Help meh!