Automatic shutdown of the computer

[exioss]

Hello,

for some time - about a week I have had a problem with the computer turning off automatically.

I have tried to associate it with some activity on the computer, but find no dependency.
The case is that I use my laptop normally and, for example, when I write something on it, I suddenly cannot write any more. The computer turns off after approximately another 3 seconds. During these 3 seconds, I can, for example, close the application normally, save the file or select icons on the desktop. Bluescreen is not displayed. It just shuts down and I have to restart it myself.
I tried to:

1. Reinstall Windows using the built-in "Fresh start" function

2. Put the system up again (previously formatting the HDD and SSD) but nothing helped either

3. I also cleaned my laptop with compressed air

4. Another step that I could do on my own was checking the RAM cubes. Since I have two, I unfastened one first and then the other. Unfortunately, in both cases the laptop kept turning off.

5.  I also tried to use (I don't know if it makes sense at all, but I'm looking for a rescue) chkdsk / r but there is a problem because before the process finishes the computer will shut down (the process takes too long). 

6.  Uupdate the possible drivers - it didn't help either.

7. I also looked (as a layman) the event log, but in the times when the computer was turned off (I checked it to the second), nothing happens.

I have no idea what to do next.

Can I somehow check what is the reason for the laptop turning off by itself? Especially that for those 3 seconds from the moment when I can't write anything, I can work normally on the computer and it just turns off - which is strange for me.

I will be grateful for any help.

[CharlieItuah1]

Hi, @exioss have you tried connecting the laptop directly to the charging adapter without the battery connected, then switching on the PC to see whether it will still shut down? That is a good way to know if it could be a battery fault or a motherboard malfunction.

[exioss]

I was about to ask if I could do it. So, normally, unscrew the battery and turn on the computer on the power supply itself, right?

/edit/

I just pulled out the battery and was working on the power supply. Unfortunately, the laptop turned off again

[CharlieItuah1]

It looks like a hardware issue then, I feel the motherboard has a fault.

Is the warranty on the laptop still valid though?

[exioss]

I also installed HW Monitor. although the computer is cool, the program displays temperatures from 50 to even 80 degrees. However, it jumps a lot so I don't know if these are real values. Previously, he had reached such temperatures while playing games. Nothing happened then.
For all delays in the settings, I changed the CPU usage to a maximum of 10%. The temperatures have dropped, the computer continues to shut down.

Can I in any additional way check if it is the fault of the motherboard?

Unfortunately, the laptop after the warranty

[CharlieItuah1]

I am having a feeling that the laptop may have overheated over time may be due to some high intensive applications that may have been run on it. I think the frequent shutdowns are your laptop's way of saving itself from a complete knockdown.