Question Overheating!!! help plz

Feb 17, 2019
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I bought brand new pc and Im having some big issues
1st one is that computer randomly just shutted down 2 times
2nd thing is that im getting glitched colors on screen like green-purple mixed
3rd I downloaded GPUz to check temperatures and since gpu max temp was 75degrees while currently it was around 70!!!!! With no reason
and cpu was 81,1 degrees
I have amd ryzen 3 2200g 3,5ghz with integrated radeon vega 8 graphics
Here is literally screenshot with taskamanger open
http://prntscr.com/mm6wra

the only thing Im doing is watching movie that even isnt in HD because there is no option for HD on that site so its like 480p!! I also have warranty on PC for 2 years so I can go to service but its weekend so... and I dont know if they will do smthng sry for bad english ty