Background: I depend on a number of static IPv4 routes on my High Sierra machine, which I add using the route command, and usually have to re-add only when moving the machine between different physical networks. But starting a week or two ago, these routes started spontaneously disappearing from the routing table at irregular times.

What macOS settings or network behavior would cause manually-added routes on macOS to be spontaneously dropped from the local IP routing table?

My primary suspect was DHCP, but I've switched to static IP assignment and the behavior persists.

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