@BrKorb 

The Address Reservation table should remain after a power cycle.  We even recommend doing a reboot after making any config changes so the changes apply.  The only way this would be cleared is if the router is losing the configuration do to manual resets,  resets caused by power related issues or hardware failures.  If you feel there is a hardware failure, contact our customer support service to complete troubleshooting and investigate a hardware replacement, if you are still under warranty.  I would note though that since you mentioned you are not using a standard frimware you would need to flash the router back to the offical firmware for us to troubleshoot or provide warranty services on the router.