Computer SHUTDOWN as i Start to render videos DELL XPS 9560 WIN 10

Hi Folks  ,

Im having issues now since I updated my PP when i start to render some videos or make muktiple task outside PP while is rendering , my computer just shutdown....I have it since Nov 2017 without any issues but specifically now with videos on 4K is making this to happen..... I run all test from DELL SUPPORT and everything it seems to be working properly...

I unistalled PP and made a fresh install again but it appears to do the same...

Can somebody help me >>

My laptop specs are:

DELL XPS 9560

32 gb RAM

NVIDIA GeForce GTX 1050

1 TB SSD

win 10