Are you running authoritative or recursive DNS server?
There are nsd(one being run on some root DNS servers) for authoritative-only server or dnsmasq for recursive. dnsmasq is being run on my router with tomato-usb opensource firmware, using around 720 kb (though, linked against uclibc).
Additionally, you can build a newer version of bind from source, if you'd like to try solving this with minimum migration headache. Though, I can't guarantee that will solve memleaks/faults.
Hope this helps.
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