@d0ugmac1 

DHCP reservation is set on the router, maybe the settings won't be assigned if you don't reboot the router.

@Virgo 

If I boot both router and controller from a long period of being powered off, the situation occurs.  I believe this is because the router comes online before my controller, and while it remembers *some* of its settings like subnets and WAN config, it doesn't seem to remember the IP reservations.  Perhaps there is a special case with the controller's IP?  Regardless, if I then reboot the router while the controller is running, all is well (including correct re-numbering of its IP if incorrectly set).  To me that says that the IP reservations are not stored in the persistent memory of the router, but are instead loaded by the controller when the config gets pushed.

It sounds like your router may be experiencing some issues with its DHCP server after power outages. It might be assigning a random IP address to your router. Try rebooting the router, it will resolve the issue. I got assistance from https://uaeassignmenthelp.ae/ to resolve errors.