PC Crashing While Previewing In Iray.

can someone please help me with this issue,so i just bought asus tuf fx505 and its a really good laptop for gaming,then i tried to render in it,so i made a scene and previewed it in nvidia iray and it didn't had any problem,but when i did it again in the other day the whole pc crashed and rebooted,is this the problem with the cpu or the graphic card,i would appreciate your help.