Upgrade to 8gb but no change

Ok, good to know.
Lets go back to core temps - Let us know how monitoring under heavy load goes, ideally until it hangs/crashes.
If sustained core temperature is hotter than, say, 85-90, you can just abandon 'cos that's not good.
 
Ok, again, might be a red herring but getting close to 70C under light load isn't really great.
I'd run your session and push the computer hard but keep that temperature monitor visible.

If you can provoke a crash with the temperature visible, that'd be ideal.
I crashed it on a large cubasele8 project..
Cpu core average temp-122°farenheit
Samsung other temp.-100° Farenheit
 
IDK. It's easier with specific detailed info but, regardless, 70 @ idle is too hot for me.
Whether it's causing your problem or not, I'd want to get that sorted.
 
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