I would like to report that this issue has been solved by replacing the Cisco ASA 5505 firewall with a SonicWall TZ-600.
After months of this issue, we have finally ironed out the problems. Over the past weeks, I had to turn off DNS cache so that normal DNS queries would take place to get around the problems.
After replacing the firewall, I turned the DNS cache back on and all queries are successful.
I did suspect that it was an issue with the Cisco, and it was!
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