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I tried initially going to 5 seconds and didn't see any difference. I then bumped it to 60 seconds. It may be a little more stable but hostnames are still failing pretty routinely. On Kea previously, I didn't see this issue at all. I can go back to Kea but it is more that I really need for my setup and I like the idea of Dnsmasq better if possible.

Recent Uptime Kuma logs

DHCP Ranges

I converted over from Kea to Dnsmasq for DHCP leases with 25.1.10. Since then, I've been having issues with hostnames intermittently stop working. I've tried 25.1.11, 25.1.12 and now 25.7.0 with the same issue. It seems that every few minutes the internal hostnames stop working. I won't be able to load a web page at that hostname or SSH into the device. Then about a minute later it comes back up. For example, I run Home Assistant and connecting to http://homeassistant.home:8123 works most of the time but on occasion with fail for about a minute then come back up.

Looking at the Unbound and Dnsmasq logs I don't see any warnings or errors, only Informational logs. Happy to post any if that might help.

The router and the devices have been restarted multiple times.

Not sure what other information to post or what other steps to try. Happy to try anything so please let me know.

Anyone have any ideas?

I've moved all of my DHCPv4 leases over to Kea a couple of months ago. Since then, none of the leases on my LAN subnet appear under Kea Leases. The leases are being handed out properly to the devices on the LAN subnet and I can see them on the ARP table. But, they just don't show as leases under Kea. Any idea how to fix this or to further troubleshoot?