I have a problem like this. I will open my laptop, browse the internet for about 5 min, and then my laptop will shut down. When I take it to Geek squad, at the store, this never happens there. I come home, open, start browsing, and it shuts down. I can start it back up immediately and have no further issues. It happens almost every time I am browsing the internet one time per day. I can sometimes get it to stop shutting down if I have started up an unsaved file in Notepad, and I can prevent full shutdown when the shutdown process says 'You have an unsaved file. What do you want to do?" (But the browser has already ended the browsing session). It doesn't seem to matter which browser I am using, ie, edge, or chrome.