The quickest solution to this issue is to disable and then re-enable the AMD High Definition Audio Device
in the Device Manager. However it's possible to create a handy desktop shortcut:
Download DevManView and put the files in C:\Program Files\NirSoft
.
Create a file called Restart AMD Audio.bat
on the desktop with the following contents:
"C:\Program Files\NirSoft\DevManView.exe" /disable_enable "AMD High Definition Audio Device"