I wonder if anyone has ever had the unfortunate problem of your 3 x 3750X stack rebooting and losing all configuration? (Version 15.2(1)E1)
In a little more detail, switch2 was in ROMMON, switch 1 and 3 were factory reset, once the rebooted. The error message we got from syslog was
Reload requested by HRPC x_setup request handler. Reload Reason: Reason unspecified.
Digging around online provides little in the way of an answer.