Intel Motherboards : Z170Extreme7+ Hard Drive Boot Issue

The hard part to diagnose it is it doesn't always happen. I rebooted yesterday after doing some updates and it went fine. I have moved the SSD to a different port, and replaced the cable. I haven't disconnected the RAID HDDs though, and I'll check if fast boot is enabled when I get home. 

The issue isn't a "end of the world" issue, but it is an annoyance. I'm currently investigating software solutions instead of using the RAID.