Hi, all. I encountered the 2nd - 3rd boot issue for my Asus Maximus Hero VII also. I HAVE UPDATED the latest 1104 bios already but the problem still exists. I am using the Kingston HyperX Beast 2400MHz DDR3 Ram 8GB x 2 set, and what I found is:
1. When I selected the XMP Profile 1, which is 2400 MHz for the ram, I will have 2nd - 3rd boot issue, for both the cold boot and restart boot;
2. When I selected the XMP Profile 2, which is 2133 MHz for the ram, everything works fine, no boot loop;
3. When I turned off the XMP, everything works fine too.
Another thing to note is that I am putting my rams in 1st and 2nd slot, so they run in single channel, rather than common 1 + 3 or 2 + 4 slot for dual channel, because I can't use them in dual channel, well, this is due to issue:
I bought an expensive Intel P3700 PCI-E SSD and after I installed the SSD on my MB, I found that I cannot use the aforesaid 1 + 3 or 2 + 4 slot ram arrangement as in that case the MB will either not boot (in slot 1 & 3) or I couldn't enter the bios (with Q Code = D5, "no space for legacy option rom"), and therefore I had to put my 2 rams in the 1st and 2nd ram slot to run in single channel.