I recently installed firmware version 1.12.0 Build 221010 Rel.35508n(4555) on my Archer C80.  It is in Router mode

I have the C80 configured as a DHCP server for my network, and I have configured it to assign another computer on my LAN as the DNS server for DHCP clients (entered in both the Primary and Secondary boxes - if I only enter it in one box, the C80 assigns itself as the secondary DNS server for DHCP clients).  If I reboot the C80, it forgets the DNS server to use for the DHCP clients, and instead assigns itself as the DNS server.  If I disable DHCP, enable another computer as the DHCP server, then reboot the C80, it forgets that DHCP has been disabled, re-enables DHCP, and resets the DNS server used by DHCP clients to itself.  The C80 remembers the IP address pool and the address lease time, so it isn't forgetting everything.

How can I get the C80 to remember the DHCP settings between reboots?