Here's a new most interesting data point. All of these outages happen right after a DHCP client connect and sends a DDNS update to BIND.
It would be an interesting experiment to isolate the zone that receives DDNS updates for the DHCP clients onto a separate server to see if that makes this problem go away for the main server, but I don't have another machine to run another BIND on and I don't think it's possible to run two BINDs on the same machine on different ports and have one (on port 53) delegate a zone to another running on some other port. Cheers, b.
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