Pls ignore the above post as I have mistakenly point to wrong solution.
Since the issue was only involving a single box/host in your DMZ, can other hosts talk to the DNS server (192.168.1.8)?
The static map "static (Inside,DMZ) 192.168.1.0 192.168.1.0 netmask 255.255.255.0" allows your whole DMZ to talk to Inside hosts without address translation, and this should work with the whole subnet.
If only one (1) host is affected, then it might be issue with the host itself. I did not see any ACL denying specific host talking to the 192.168.1.8.
BTW, do you see any deny statement in the firewall log when that particular host tries to resolve/communicate with the DNS server?
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...