sounds to me like everytime your computer goes into power save mode its not booting the sound card back up. Only advice i have for you is to visit the windows update and under device drivers make sure there is no update for your sound card, and two is maybe try installing a new sound card they are pretty cheap you can find one for like 10-15 bucks. It could also be an issue of power or the card not fully pushed in
I have to reboot my computer to get my sound back. If I leave it on standby or just let the computer alone for awhile, when I get back to it, I have no sound so I have to reboot it to get my sound back. Any help with this would be appreciated. Thank you.