Might be to late now but your video shows an additional PCI-E card, Lycom...
Did you ever try without this?
Yes mate, I did as well. I sorted the problem buying a new motherboard. I still want to use the UD5, I sent it back to the shop and I'm waiting feedback from them. For now I'm using an MSI X99A Sli Plus and everything is working perfect, however, I still prefer the Gigabyte because I had better benchmark results with it.
If they send a new board and it works fine, I'll keep it otherwise will keep this one that it's working perfect.
Cheers
