Difficult to say. Peer Terminate means the other end has cleared the connection for some reason, but without more information it's impossible to tell why. Doubtful it's configuration, unless it's coming up during the tunnel negotiation process. If the tunnel establishes correctly then your config is probably OK, but you could have an idle timeout or absolute timer set under the group parameters, so check them.
Checking the logs on the head-end concentrator for the same time will probably tell you more about what's going on.
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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...