How to fix system restarts in Genshin Impact with MSI B450M MORTAR MAX?

In Liyue Harbor, Genshin Impact dropped from 240 to 120 FPS due to voltage drops, making aiming impossible. I tried a thicker 24-pin cable, but loose contact caused more anxiety. I used the GamePP Resource Scheduler to set Genshin Impact priority to Real-time and monitor VRAM bandwidth. RTSS showed frame time stabilizing from 4-15ms to 3-4ms, and GamePP Hardware Sensor confirmed VRAM bandwidth at 85-92%, settings.