Windows Shutdown without warning

[Dhruv9076]

I am having this issue for more than a 3 months. MY PC shut automatically shutdown and restart automatically , sometime it does and sometime i had to force close amd restat as it doesnot automatically start itself. 
I tried showing up to local PC repair guys but they can't find any issue and they can'teven find why is it happening. I just can't find the issue. Is it a Software or Hardware ? If its hardware then how can i troubleshoot to find which hardware is causing. I tried using UPS to satbalize the power but still same issue. PLease help me to Troubleshoot.

 

[Guest]

Hi. Can you please list your system specs?

 

Check windows event viewer at the time the restart or shut down occurs. What's it tell ya?