unbound resolving different address intermittenly

[Andrew Meyer]

I have recently setup unbound on CentOS 7 (latest) running version 1.6.6.  So far unbound has been chugging away for about a month.  In my configuration I have an on premise server configured with lots of internal forwarded domains going to Amazon Route53.   As of yesterday unbound started to flip/flop resolution from the internal/private zones to the external zones.  I'm not sure why.  I have turned up the logging verbosity to see if there was an apparent issue.  I though at one point we hit a wall with number of packets per request.  My colleague and I thought we hit a resource records maximum limit.   We have opened a ticket with Amazon to get more information on their side.  
In my config file:num-threads: 4 so-rcvbuf: 4mso-sndbuf: 4mcache-max-negative-ttl: 10do-ip4: yesdo-ip6: yesdo-udp: yesdo-tcp: yes

Everything in my zones config file is a forward-zone and not a stub-zone, not sure if that matters.
Any help is greatly appreciated.
Regards,Andrew
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