I'd personally execute against the wall guys who made these bioses. My 4790K suffered from GA mobo, and also from Asus mobo the same lot.
You need to disable all of the OC features in Your BiOS/UEFi. Set all the CPU-concerning features not to "auto" but to "default". That would help.
I was solving the same issue here some time ago, nearly ran me crazy. Also turn off all OC profiles.