Why does Fortnite crash to desktop every 20 minutes during builds?

During large-scale building battles, the game crashes to the desktop every twenty minutes, which is absolutely maddening. I first tried limiting the maximum frame rate via software, but while crashes decreased, the smoothness was severely compromised. I used the GamePP BIOS Load-Line Voltage Wizard to set the load-line to L3 mode and increased the offset voltage by +0.02V. MemTest86 confirmed fluctuations were controlled within 0.01V, and HWInfo64 showed memory temperatures stable at 48-54℃.