I am using the most current and updated version of ClearOS as of 1/10/2020. I have notice a strange problem that occurred twice in the last three months: on both occasions, the static routes that I have assigned to em1 would disappear from the routing table thus affecting traffic to those destinations. In order to repopulate the table without having to reboot the firewall I would run /sbin/ifdown em1 && /sbin/ifup em1. I also read that you can run /etc/sysconfig/network-scripts/ifup-routes em1 to do the same thing. Even after a reboot, the issue showed up again several weeks later.
This device has been running fine for a few years without any issue so I am not sure if it is a recent update or something that's causing this to happen. Any help would be appreciated.