'Yes, good to hear. Nice catch on the USB port, Cactus. I might never have gotten there.'
I think Bob mentioned it first but I didn't actually read his long post, I tend to skip those. I have read this issue coming up here and there on other forums where ( some?) USB 3 ports just screw things up.
My DAW is dedicated ( no internet etc) so I have no use for on board. There was always a issue with the onboard taking over if you played a song in WMP or winamp. You would return to Sonar and it would be telling you something was wrong or worse, it would play slow. So I disabled the on board and set Sonar to share drivers a long, long time ago and all has worked since. I think this issue is system specific. Not all systems behave this way.