I just noticed the new upgraded firmware (V2.3.5.30) and in the release notes is this fix:
[Bug Fixes] The client was not able to obtain an IP address when the router rebooted or the client renewed the IP address
I'll try to update over the weekend when I have some time, but this seems like a likely fix to my issue since my problem was that subsequent reboots of my large network always ened up with some devices unable to obtain an IP Address (with different numbers not working each time). I'll report back if this fixes it, but I'm hopeful.
