Yes, the mic is the default device. It seems Windows detects it. It just stops working.Have you checked Sound Settings to see if the computer is defaulting to another device?
I tried this. It didn't help.It could be power management putting the device to sleep after a set idle time.
Go to Device Manager > Universal Serial Bus controllers
Properties for each USB Root Hub
Click 'Power Management' tab
Uncheck "Allow the computer to turn off this device to save power" if checked