Using this: https://openwrt.org/docs/guide-user/base-system/dhcp and Daemon warning in log - #3 by Peacefuleight
It pointed me to the DHCP control file. /etc/config/dhcp
I manually removed the DHCPv6 entries. Im going to evaluate if this solves my issue, possibly yours too.
Even with IPV6 off the following entries were still being found,
Update:
Appears that edit didn't fix it either. I could probably go scorched earth and remove the DCHPv6 packages but that would be counter intuitive as IPV6 is growing rapidly in implementation, mostly with the cellular providers.
Now I'm trying putting the default IPV6 route back on the LAN interface. Its a private address and I removed it because I didn't want to hand out IPV6 anything internally. Ill continue to monitor and let you know if I find the fix for the log spam. Just note that these logs are not detrimental if you don't use IPV6 but they can bloat logging. Optionally you can change the log level so you dont see them anymore as well.
Its been about 15-20 min now with none of those logs anymore. So it appears that removing the "default" route in the Global Network Options for IPV6 might likely be the source of the problem. I mean looking at the logging it is complaining of missing a default route so this tracks.
I would think that this is likely a bug that can be fixed or a note put on the Global Network Options page notify the user that a default route must be populated if IPV6 packages are installed, even if disabled or not used.