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I'm on an Intel/nVidia dual-GPU laptop.
Could be crashing on alt tab if PC tries to switch to iGpu for DE?
Nvidia is likely the problem, also you mentioned dual gpu, make sure your not on your iGPU
Edit: details.
I'm not on the iGPU. I use prime-run to run Steam, and all games properly detect the nVidia card. Also, I doubt the iGPU could run Hitman at max settings at 60FPS@1440p.