Game crashes without Vsync

I have rtx 4090 card but whenever i push the fps over 500 fps (without Vsync) with the best graphics, the game crashes although everything is alright when i look at the GPU stats.
i have to use Vsync and lock the fps at 165fps (my monitor is a Huawei mateview GT34 165Hz).
I don’t know where the problem comes from.