Specific games can use the GPU in ways that that others don't, and hit a weakness.

What GPU (and brand) is it? It's been said that some RTX 3000-series cards had issues with power spikes, leading to reboots.

Otherwise it could be a sign that your PSU isn't performing adequately. It could also be RAM issues, or cooling issues, but one can't be sure about any of these things.

Here's a link to a page with some tips. A quote:

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The most common PSU related issue that can cause this problem is when you have an underpowered power supply. If your PSU is unable to provide sufficient power to your system under load or gaming, then it will shut down to prevent itself from any damage.