desktop re start when i try to mesh a model in high details

Hi, this is a crash or what else ?, when i try to mesh a model after alignment, the desktop suddenly restart ehwn it is going close to 40%, and then it continues where it left, but again restarts again and again, why is this happening ??

my desktop is intel core 9 485k, with 128gb of ram and rtx nvidia 5070 TI graphics card

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