I have been having a similar problem, but i had a visual studio debugger coming up, and when i closed that it would automatically kill thie svchost.exe.
After a little research i found some forums
(Link) they said go to services and re-enable the windows audio by going to
clicking start> run> type 'services.msc' [WITHOUT QUOTES]> Scroll down to Windows Audio> double click Windows Audio> If it has not been started, or has stopped click start>
I took it a step further in hope that it would not happen again.
In the Windows Audio Properties windows click on the tab 'Recovery', You will see a First, Second and Subsequent Failure drop down menus i set all of mine to 'Restart the Service'.
So far i have not encountered any problems. Im assuming after 1 minute of this services being disabled it will be turned back on.
Hope this helps you, and anyone else looking for svchost.exe audio