Your sound system is going probably, the one on the MB or your card. This
is typical of an overheat condition or poor circulation within the box.
If you pipe sound through a powered speaker system it could be the
transformer there. When you shut down and reboot it gives the malfunction
enough time to cool down enough to resume.
"Jim S" <> wrote in message
news:wd648i8xub8$....
> Sometimes my sound loses volume which cannot be restored without a
> re-start.
> Does anyone know why?
> --
> Jim S
> Tyneside UK
> http://www.jimscott.co.uk