Biltre

My PC shuts down sometimes out of nowhere. i thought it was because my computer was quite dirty and it was causing a overheat but after cleaning it i still suffer the same problem, i don't know how a CPU works, neither which would be consider a normal temperature stauts under heavy or no load at all and why this keep happening so any help or insight about the problem would be welcome. Info: QuadCore Intel Core i7-4790K, 4400 MHz (44 x 100) using a Corsair Hydro H100i Asus Maximus VII Hero 8 GB Corsair Veng. 1600 MHz The averege "CPU throttling" was about about 6% to 10% (Sorry for any mistakes english isn't my native language)