Question Computer Randomly Shutting Off

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Deleted member 2730916

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My computer is randomly shutting off completely whether I'm playing a game or not. My temps are normal. I used the Windows memory diagnostic tool and it said that my ram is normal however I do not know how reliable the Windows Memory Diagnostic tool is. This issue started a few months ago but I updated my graphics drivers which made the issue go away for a while but then it recently came back and in response I updated my graphics drivers again but it is still happening.

Here is my build
CPU: i5 4690k
RAM: 8x2 ddr3 1600 Hyper x Fury
Motherboard: MSI Z97 PC MATE
PSU: Green labeled CX 500
GPU: EVGA GTX 1660 Super
Storage: WD 1 TB 7200 RPM & Samsung 860 evo 500 GB SSD
I also have 3 case fans

I am suspecting the issue is with my PSU as it is a green labeled corsair CX series and I heard that those are terrible and I've had mine for about five years now. What is strange to me is how the graphics driver update made the issue temporarily go away. What should I do?

If I should replace my PSU can someone recommend me one? My budget is around 100 USD and I would like a PSU that would be able to handle future upgrades.