Thank you for the suggestions.
I've tried to uninstall/reinstall the audo driver, and reset power plan to default. Same thing happens. Even tried disabling the Realtek audio device in BIOS.
When the Realtek audio device is disabled, the Nvidia High Definition Audio device (audio output from Nvidia graphics card to the monitor) shows as the device that reports "An Audio Stream Is Currently in Use".
I read that "High Definition Audio Device" is the Microsoft generic audio driver. Since both Realtek, Creative and Nvidia uses the same one, that might be the issue.
I tried installing my Sound Blaster card with Creative's newest WDM driver (Creative X-Fi Audio Processor), but the card is EOL, so the driver is no longer working.
Will buy a new sound card and test with something else than the generic driver from Microsoft, hopefully that fixes it 😊
