hi, in past experiences when a pc shuts down under heavy load, its a power supply realted problem, can you plz tell us you pc model and brand, or the specifications if you built it yourself
It sounds like your PC is hitting a Thermal Overload Protection (overheating). Try to open up the side panel and put a fan blowing inside the case to see if this fixes the problem. If it does fix it, you need to get a better CPU or case cooling solution. If it doesn't, you may want to do some diagnostics on your CPU, GPU or RAM. Sounds like overheating to me. though.
hi, in past experiences when a pc shuts down under heavy load, its a power supply realted problem, can you plz tell us you pc model and brand, or the specifications if you built it yourself