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PC restarts randomly Windows 10

In the past few months my now 1-yr old PC is randomly restarting. Just randomly. I'm here to ask for some help diagnosing the problem.

So first up:

The problem occurs at random times. I could be gaming, or browsing chrome. There is no blue screen or restarting message, the screen just goes black for a few seconds and then proceeds to boot as if I had just turned it on. The lights in my PC stay on, but my keyboard and mouse LEDs turn off.
I ran a windows 10 memory scan, came up clean. Also checked temps, fine. I disabled automatic restarts in the control panel, yet the restarts still occur.
The issue has no particular time frame. I've had days without it, and then it will happen 3 days in a row. It usually only occurs once a day, however.
I'm led to believe it is the stock PSU, however is there a way I can check? Thanks.

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Clarification Request
Tell more about the PSU and PC.

In reply to: PC restarts randomly Windows 10

1. What is the make, model of the PSU?
2. Is it split rail? (If you tell the answer to #1, we'll check it out.)
3. What is this PC?
4. Are you keeping up with cleaning and fan checks?
5. Is it inside some computer desk with blocked cooling?

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More info

In reply to: Tell more about the PSU and PC.

1. A stock PSU that came with the Chinese case.
2. What is split rail?
3. A bad, prebuilt PC that I upgraded with more ram, a GTX 1050 and a Corsair h80i v2 AIO water cooler.
4. I did some cleaning a few months ago when I installed the new cooler.
5. It is on top of a desk with plenty of airflow room.

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Too liitle detail.

In reply to: More info

But in answer, a split rail is when the +12V had more than one rail. You find this reduces the total Amperes on the +12V and has lead to very hard to pinpoint BSODs and reboots. I did not write this is the cause here. It's something we check out once the details are known.

About the new cooler. I continue to run into PCs with no heatsink compound or a heatsink that didn't land squarely and make full contact with the CPU.

You didn't write if the reboots happened before as well so the new cooler is now suspect.

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In reply to: Too liitle detail.

Happened before the new cooler was installed, so sorry forgot to mention that

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