Thanks for confirming the problem. I found for me that certain games are causing the problem. There's no problem with Mazera or Robo. But Arvale is another story. If I run Arvale and exit the game by hitting the Esc key on the tablet, there is no problem with the sound. But if I exit Arvale by tapping Quit on the menu, then that's when the sound problem happens. I exit out of Garnet and then rerun Garnet and no sound in any game.

Thanks for mentioning the rebooting fix. I tested that again and found that rebooting the tablet with it plugged in doesn't fix the sound problem. My tablet has to be unplugged and rebooted for the sound problem to go away. So rebooting this way does fix it fine. At least for now it's nice to know there is a way to fix it.