Why Does My PC Reboot While Playing Dota 2?

Hey folks! I've been experiencing some really annoying issues when playing Dota 2 for the last few months. Out of nowhere, my computer reboots while I'm in the main menu or picking phase. It's strange because it doesn't seem to happen during actual matches—maybe I'm just lucky? I've checked everything, wiped my SSD, and reset up my PC. I've updated all my drivers and chipsets and even ran memory tests with Windows and memtest86. I've also tested my power supply, and everything checks out fine. There are no issues while playing other games or using my computer for anything else. I've seen some kernel-related error messages in event viewer, but I can't find any specific hardware issues. Anyone have any ideas on what could be causing this?