PC becomes unable to function after a duration of time

[Windows 10]

My problem is that after a while of normal use, my pc just stops working. I can move my mouse and click on apps, but nothing will open or function. If I try to search in the start bar, it just gives me a gray square. There’s no malware, I even did an offline scan. I tried to cut off startup applications but nothing changed. Everything stays open, but doesn’t work and I have to use the power button. I can open the start menu but it hardly works.System info:Gtx 1660 SuperAMD Ryzen 5 2600 Six-core16GB RAM

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