I also had this couple of times - suddenly board refuses to boot with settings that worked previously, even conservative ones like 2400@1.85 or 2200@1.75, so I think "wtf? degradation?" and then few restarts later there is a double reboot, and things are working again. Had this with both 3258 and 4690k + PSC as well as 4690k and Hyper/BBSE, CPU @air/SS.
No issue for me as there seems to be no permanent damage, but it's definitely a setback, yet nothing compared to what I went through with various DFI boards in the past. Perhaps solar flashes