I have a Dell xps 15 with Nvidia Gt-525 graphic card.The laptop just freezes within a few minutes especially when playing youtube videos or playing games.So I googled the problem and found that it is common and is due to overheating.So I switched permanently to onboard Intel graphics permanently and even uninstalled the drivers for the nvidia card.The laptop runs for a little longer time,but switches off within 30 minutes.I was noting the temperatures of the processor cores and the max before it switches off was 65-70*C.Is the temperature too high?Is it a hardware problem?Please suggest some solution.