Hey Shurtugal,
Here is a link to AMD detection tool. I recommend uninstalling the drivers and then going to the link to install the latest right from AMD. The sound does stop momentarily as Windows is letting you know that something has been removed. Did this happen before or has it just started. Wonder if a system restore would help with both issues? If this does not help please call our technical support at 800-474-6836. If you are calling within North America, the number is 1-800-474-6836 and for all other regions, click here: click here.
Thanks.