Video Source Suddenly Stops Appearing

A video source for an HDMI Camera that is connected using an HDMI to USB converter has stopped appearing all of a sudden. This source has been working for over 2 years without any problem at all. We also cannot see the "grab handles" for the video source when we unlock it. If we move the camera to a different USB port, it works. But in the device manager, we are not seeing any problems with any of the usb devices. The computer has 2 internal USB buses, and those also do not show any errors in the device manager.

Any thoughts on what could be wrong? How to trouble shoot?

I thought about removing the USB device in Windows and allowing it to reinstall, but I'm not sure how to identify which USB device is being used by the camera....
 
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