QuickCam Communicate Deluxe problem

My QuickCam Communicate has worked perfectly OK for some time on my Desktop 12.1, but recently I note that it sometimes ‘disappears’ when I try to use Skype or Twinkle (SIP Phone), hence I have no microphone. Simply removing the QuickCam from it’s USB port, and then re-connecting it, fixes the problem. Anyone got any suggestions?

Bus 001 Device 034: ID 046d:0992 Logitech, Inc. QuickCam Communicate Deluxe