This document will help you enable Auto Reboot on Icon series running 2.9.0 or higher.
You may also Check out our Icon help page that explains this in further detail here: http://www.lifesize.com/icon-help/en/advanced-topics-scheduling-automatic-reboot.html
NOTE: A system that is idle and has been operating for more than 24 hours (without auto reboot) will immediately reboot when auto reboot is set (if its idle) because the desired condition of rebooting once every 24 hours has not been met. To check the current uptime of the Icon, use this command:
get system uptime -V