Steve,It looks like your getting god help here,just wanted to share my experience.
I had problems similar to yours eventually one of the USB ports went out /failed permanently.
Just weeks after another one bit the dust.
Talking with a tech ,he said it is a common problem on some MOBO's
Generally leading to eventual MOBO failure.
Because I didn't want to mess with a new MOBO,he suggested installing a PCI/PCIE usb card,so I went that route.
Easy to install.
These ports have been working rock solid for about 2 years now and seem a bit faster than the onboard ports.
I think it cost me $25.00 U.S.
I hope you get it fixed.