Sometimes servers need to update its status or reboot by the condition to return its status to the best working environment to remove junk process or something like that. You can check that status by shell script.
Below script makes server to reboot if ping does not work:
In my case, I run above scripts by cron job in every 10 mins.
If you want to run above script at AsusWRT, you will need to modify the first line as following