Is this in reference to the posted output to show stacking found on this thread
Help! Stack unexpected reboot
If so, consider the output previously posted and understand that if the stack is still in a master / standby configuration and daisy chain. The assumption is that there is only 1 stack cable connecting the nodes. This means if standby looses connection to its master for any reason (in this case disconnecting the stack cable) it will reboot because it is not master capable and relies on communication to a master.