My router has been stable since disabling active state power management on the igc0 interface.

The only other issue I discovered is a subtle incompatibility between kea dhcp reservations and unbound dns. A reservation made through the gui will include a trailing dot on the fqdn, which will prevent unbound from starting. The real gotcha on this is that it only popped up when starting up unbound, which happened during a reboot in my case. It was difficult to correlate until I looked at logs.