your problem may be your cooling. your CPU paste may be very little, my suggestion would be to check your CPU and see if there is a lot of CPU paste, if not get some silver compound not the silicone stuff. and that's probably your issue, your CPU max temp is probably set to 70 so your CPU doesn't overheat and fry itself. that's my suggestion to you.
really? usually, my temps are around 53C and mine isn't even a gaming laptop, but yes check the GPU and if that's not the case I would check the max temp. download MSI Afterburner if you don't have it already. it tells you basically everything and even lets you record games!