My laptop suddenly shut down

After providing your garuda-inxi (even better from the installed system, possibly) I think you should start familiarizing with HW troubleshooting tasks.
The following guide was focused on different problems (freezes and the like), but most of the suggestions for HW still apply.
At least you could start working a little bit with your live USB, to see if it shuts down as well, then you should check at least your RAM and storage. Then in my opinion, if everything is fine, you can safely install other tools and check as much as possible of the rest (or, even better, you do it with live disks).

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