Why does Phantom Brigade cause black screen reboots on launch?

I was terrified when my system black-screened and rebooted the first time I loaded a map; I thought my hardware was dead. I tried disabling all power-saving options in the BIOS, but that just made my idle temps soar to 65℃ per HWiNFO without stopping the crashes. I finally used the GamePP Power Plan Switcher to lock the system in High Performance mode and disabled core parking. OCCT tests confirmed voltage stabilized at 1.22-1.28V, and VRM temps stayed at 55-62℃ per HWiNFO.