Check bios options, update bios, unplug all peripherals and check if it's still happening.
this post was submitted on 15 Aug 2023
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Has this just suddenly started happening (if so, what changed), or has it always done this?
I have a (Windows) laptop that's started doing this and I was convinced it's hardware, but recently I closed every single application down before shutting down and it didn't restart...
But, I would start with hardware / BIOS first.
Maybe try to use other GPU driver, like nouveau instead of proprietary one (or vice versa). But first unplug all peripherals and check if it helps.
Edit: this might be helpful: wiki