+1 to Bit's analysis.
If you have a crash, kill in Windows then for hardware, try powering down the USB (or, shock, firewire device), and re-boot. That should put things back into order.
However, I would venture you have a software problem which is not probably Sonar's.
Software updates all round. jBridge update if necessary. Change 32 bit for 64 bit plugs etc.
Or, at your risk, delete all USB hubs, re-boot with nothing connected (mouse, keyboard excepted) then reboot again and after plug in your devices one by one then let Windows re-recognise them and re-install all USB software.
PITA, I know, but for Firewire it works. So why not USB ?
Cheers,
Jerry