Hi @lokikhan ,
the restarting PC is usually caused by hardware crash (collapse) or unexpected system thread stopped. The first case is easy to “demonstrate”. If we will think about the system crash, it doesn’t mean that you will automatically get an issue with a blue death.
'''System or software crash:'''
* Run the Event Viewer on your PC
* Select the Windows Logs
Then select the categories for view any issue or messages, so start by clicking on the first Application category and search for the issue in time, when your PC goes to restart. After you check the first category, proceed to the another. If you will find any issue, you can post the logs here to see what you can do, otherwise insert error message to google and find the solution there.
'''Hardware issue'''
* Download Stress Test for the HW
In several times, the stress test is a complex application, which can measure the performance and temperature in real-time during the high-performance test. If some hardware is about to crash, the stress test will show you the issue and you can easily solve the issue. There are a lot of versions of Stress Test software, find the best one for your PC. You must check the performance of GPU, CPU and RAM.
After you will be done, post some result from your investigation.