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This sounds like a build-issue.
RTX 4090 is a very power-hungry GPU, especially on the top end. It can suck down a lot of power, especially if FPS is unlimited and graphics setting are very high.
If your computer ever runs out of power, the computer crashes, even if it loses power for just 5-milliseconds, you're screwed. Only the beefiest power supplies can power that kind of high-performance load.
Sounds like a hardware issue. My first guess would be the power supply. People often overlook it or cheap out when they build their PC
It could also be a RAM issue. If your memory is running too fast, it may cause sudden crashes. Check if XMP is enabled (which it should be) and if it is, turn it off. That should run your memory at a slower speed. if the problem persists, then your memory is probably not the issue. If it goes away, your memory may have been poorly binned by the manufacturer and can't reliably run at full speed.
Sure you can do that as a test, it would not be great to just... accept it. If the problem goes away doing this look into better RAM.
Also, look into stress tests, there's some for the GPU and for the RAM, this way you can pinpoint where and why the crashes happens.
Given that, please be aware that running such a GPU and needing these kinds of advice is akin to running a Ferrari not knowing it needs gas to run.