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Same reason my old man is getting an off the shelf system for monitoring their house in France. My HA setup works perfectly but does need a bit of knowledge to keep running at times. Actually same for my old router setup, I moved to a TP-Link mesh AP and then bought a Firewalla for all the smart stuff as the old DDWRT setup was unusable for anyone else if there was a problem.
Aaaaand I'm back up and running.
I think you both may have been correct / put me on the right path - Some of my hardware (like the APs) decided to revert back to DHCP for their IPs (or I may have completely omitted to assign static IPs on the devices, and just on the router / DHCP server instead)
I ended up factory resetting the router and switches, and rewriting all of the config from scratch.
Which means that I now have a clean config file, but also the scripts that I need to create them.
I then had the usual pihole DNS problems, which took an age to figure out - turns out I needed to remove the rate limit on requests coming from the router IP, as all requests come from there.
In all, I reckon 12+ hours. I think I need to show some consideration to my partner, who asked what they would do if I wasn't around.
I'm thinking that as a failover, I just have an all-in-one modem/router/switch with zero fancypants on it.