Why does the computer turn off under load when overclocking RAM?

Question

RAM

Acquired a new platform:
1. Motherboard GIGABYTE B660M DS3H DDR4;
2. Intel Core i5-12400F processor;
3.RAM Patriot Viper Steel 16 GB (1 bar);
4. PSU old FSP PNR 500W;
5. Video card gtx1070ti.

Actually the problem is this:
When you set the XMP profile to 3600 MHz, 1.35v during the game, and more often when loading locations in games (there may be a load on the video memory when loading textures), after some time ~ 30-60 minutes the computer turns off and turns on again. Everything just goes off abruptly, and then turns on. It's definitely not a blue screen. If you set the memory frequency to 3000 MHz, then the shutdown occurs much later - about 3 hours. The computer is not cut down if the load is carried out at the stock frequency of 2133 MHz up to 2600 MHz.

Answer 1

It works like some kind of protection.
I see two options:
1. The power is back to back, and when you even slightly increase the voltage on the memory, it is no longer enough
2. Problems with memory (does not hold overclocking, is in the wrong slots, broken, etc..)