PC loses all connections to monitor, keyboard, mouse, etc. then restarts after a few minutes

My PC loses all connections to monitor, keyboard, mouse, etc. then restarts after a few minutes when rendering shots on the timeline. I have a Ryzen 9 7950x, 64gb ram 6000, nvidia rtx 4090 Gigabyte, SSD drive. I can handle very intensive processes (gaming, rendering) but in some occurrences this happens and is frustrating.