System freezing and not being able to do anything when i open multiple apps. Please help

[Windows 11]

HelloMy PC has been having this issue very recently where i will boot it up and everything is fine and than i will play a game like Fortnite and when i open another tab like chrome it freezes everything stopping my keyboard from working only my mouse works. Once i wait like 5min nothing is happening so i try to click the power off button and that doesn't work either so i have to hold down my power button for like 10 seconds and than it shuts down and works again but keeps doing the same thing over and over again. {note i have already downloaded all the new drivers for everything and did the co

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