To begin troubleshooting, I'd recommend clearing the event log and loading the BIOS default settings:
Restart the system into BIOS by pressing <F2> during the boot process. Once in the BIOS setup utility, press <F9> to restore BIOS default settings. Reset any customized BIOS settings. Clear all DMI event logs by setting the option to "Enable", which is located in the Advanced/Event Log Configuration section of the BIOS Setup utility. Make sure the hard drive pre-delay under Advanced/Drive Configuration is set to 5 secs., at least. Press <F10> to save the new settings and reboot the system.
Hope that helps!
While I didn't clear the event log in the BIOS, there are no events listed there. I have reflashed the BIOS and that didn't help. I didn't try hard drive pre-delay, but I'm pretty much out of time to continue on with troubleshooting. I have abandoned UEFI/GPT and am deploying with BIOS/MBR which gives none of the anomalies that the former gives. I'll look at the technology again at a later date when it is more evolved and debugged.