Hi Fly !
I am not familiar with Win$7, but, have you checked if the yfwcm.exe process is still running?
After the “audio collapse”, if you click on the “Yamaha Steinberg FW Driver” icon on you taskbar, what do you see?
Another idea would be for you to check the system log files and see if there is any entry related to the audio KIA.
Br,
M.