Hey, I really need help. My PC started doing weird stuff last few days..

[Microsoft Windows]

First of all it takes like 5 minutes to shut down with all apps closed its just saying shutting down, now it began droping gpu wattage and util mid game and its not every 10 minutes but like every 20/30s I get a drop sometimes last a second sometimes my game freezes for over 10s I tried everything from yt and tutorials I found NOTHING works I really dont know what to do else could windows reinstall help? Should I just erasw all data and start it from scratch even tho I rlly dont want that I have so many games and files and my wifi is so slow I dont want to download it all

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