The renegotiation is automatic if interesting traffic is passing through. It is quiet possible that traffic from LAN2, LAN3 and LAN4 is not configured as interesting. That would mean that even when the tunnel is up and running, traffic from these three LAN's is passing through unencrypted. I guess you should have a good look at the access-lists that you have used to specify interesting traffic. Also, I could find only a single bug related to ISAKMP SA renegotiation but in that case the router will reload. All the same, you couls also refer to bug CSCea43713.
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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...