Windows 10: Laptop instantly turns off and restarts automatically

My laptop is a Lenovo with 8GB RAM, a 1TB SSD, and an AMD Ryzen 5 5500U processor Windows 10 currently, previously I had 11. Restore to 10 as I thought maybe reinstalling a lower version could help solve the problem.The problem I'm facing is that whenever I'm working on my laptop, it instantly turns off and restarts automatically. I scoured the internet and found some suggestions that it might be due to overheating of the fan. Consequently, I took the laptop to a service center, and they cleaned the inside thoroughly. Additionally, after explaining my problem, they suggested that reinstallin

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Computer keeps randomly turning off then instantly turning back on

Computer keeps turning off then instantly turning back on im really frustratded now becausw if tryed loads of things to stop it but nothing works heres a list of what i tried,

turning off automatic restart, haviving a look at the fans speed and it was normanl, having alook at the cpu tempriture it was normal, testing the ram it was working fine.

i cant find a soulotion and i would really appricate help

 

Automatic Restart

We appreciate your response. We suggest that you turn on the automatic restart using command prompt. However, you need to access the
Startup settings. On some Windows 10 computer, pressing
F11 once a computer boots up will bring the System Recovery menu. We suggest that you check if it's the same on your computer. Here are the steps on how to do so:

• Turn on your computer, then press F11 simultaneously.
• If a blue screen with Choose an option shows up, click on
  Troubleshoot.
• Look for Advanced options, then click on Command Prompt.
• On the command prompt, type this in "wmic RecoverOS set AutoReboot = True".
• Once done, click the "X" at the top right of the screen.

Restart your computer and see if the issue persists.

We would appreciate it if you'd provide a screenshot of the command prompt.

We're looking forward to your feedback.

 

System restarts automatically?????HELP!!!!!

Turn off Windows Automatic Restarts so you can see what type of BSOD the system is popping.