Other than panic reboots (panic reboots are turned off) and reboots forced by the CPU on insufficient voltage (the CPU is never taxed, albeit undervolted with minus 30 on all cores in PBO), have you ever experienced random and unexpected reboots? The other day, I noticed that one of my servers - serving only torrent uploads, an i2p router, a Snowflake proxy and an sshfs connection for media consumption - had rebooted for seemingly no reason.