Hi Lois,
i send you my Mailadress for the testbios, thx for that.
Did you already test it?
I have the same Issue, I´m using the Nuc for Openelec XBMC (Linux OS) and installed the OS on a USB 3.0 Stick.
After starting the NUC, i have freezing too and sometimes an Errormassage. After Reboot, Openelec boots from the stick and it works.