Comment 7 for bug 1313279

FWIW - I replicated the issue on a Gigabyte H97M-D3H board, exactly the same symptoms and effect.

However, disabling xHCI in the BIOS (so all USB3 ports fall back to USB2/EHCI) and the problem is no longer apparent.

My suspicion is thus the newer chipset: both of my boards are H97, and the OP's NUC is a Haswell unit, I think, so will have similar chippery and/or microcode in it.