Screen freezes on Rpi4

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I've just gotten a RPi4 (8gb), and this is my first time using any Linux operating system.

I'm using my RPi to stream videos to my Apple TV (files are stored on an external HDD. Sometimes (usually after about 1 hour since booting) the screen just freezes, and everything is unresponsive. I can't move the mouse, and I've to use the keyboard to restart it (I've tried REISUB and opening the terminal and typing 'sudo reboot'), but nothing happens.

I think it's just the screen (and maybe my keyboard and mouse) which is frozen, because I can still access the videos on my Apple TV.

I've updated Ubuntu to the newest version (21.10) , and I think everything else is up to date as well.

Thanks for the help!


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