Why is this new windows update continuously shutting down my computer?

[Microsoft Windows]

I installed the new windows update around a week ago and it seemed to be a pretty big one as it took around an hour and a half to install. It said to restart my computer to fully implement the update so I did and since then it has been TERRIBLE. I use my computer for around 45 minutes to an hour uninterrupted and when I'm done I close the lid regularly. I come back maybe 2-3 hours later and the computer has shut down? I used to be able to sleep for a regular amount of time, do my daily routine and come back to my computer ready to go, basically it used to not shut down after closing the lid. I

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