Windows 11 laptop keeps shutting down or restarting when idle

[Windows 11]

Hi, I'm not very Windows literate but need some help with this problem, as I rely on my computer for work and am worried it will start happening when I am working on a client's project.As the subject line states: I'm using a laptop running Windows 11 and almost every time I leave it for more than a couple of minutes, it shuts down or restarts. Bearing in mind I really have no idea what I'm doing, following online advice from articles etc., I've tried:-- running the following command lines (on several separate occasions)ISM /Online /Cleanup-Image /CheckHealthDISM /Online /Cleanup-Image /ScanH

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