I'm not happy with the wording, but if the problem it actually causes the systems to entirely reset and go to post again automatically, spontaneously reboot probably is more accurate than crash, as it implies crash (but the implication may be missed by some). Also, depending on the role of the system, and how often the reboots happen, which is worse of a crash and a spontaneous reboot may be different. A reboot once a day is different than a reboot once every 10 minutes which is different than a continuous reboot prior to completing the boot process.