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Hi,
my ISP distribute dynamic ipv6 prefix via dhcp request.
I've downloaded and compiled isc-dhcp v4.3.5 bundle.
This version works really fine with the IPv4 protocol.
With IPv6, I think there's some race condition(s) during renew/rebind
operations.
Sadly i've lost the log of the renew.
Once the problem raise I lost my IPv6 connectivity. If I just re-run
(without any other operation) the dhclient program, my IPv6 come back.

The command line:
/opt/isc-dhcp/sbin/dhclient -v -6 -P -D LL -cf /etc/dhcp/orange/832-6.conf
-pf /run/dhclient6.vlan832.pid -lf /var/lib/dhcp/dhclient6.vlan832.leases
vlan832

Hope it helps, if it miss something, please, tell me.
Regards,
Pierre.

Below a trace of the error during a rebind:
/var/log/syslog:Jan 14 12:26:03 hathi dhclient: XMT: Rebind on vlan832,
interval 636660ms.
/var/log/syslog:Jan 14 12:36:40 hathi dhclient: XMT: Rebind on vlan832,
interval 638980ms.
/var/log/syslog:Jan 14 12:47:19 hathi dhclient: XMT: Rebind on vlan832,
interval 554790ms.
/var/log/syslog:Jan 14 12:56:34 hathi dhclient: XMT: Rebind on vlan832,
interval 652810ms.
/var/log/syslog:Jan 14 13:07:27 hathi dhclient: XMT: Rebind on vlan832,
interval 626890ms.
/var/log/syslog:Jan 14 13:17:54 hathi dhclient: XMT: Rebind on vlan832,
interval 583560ms.
/var/log/syslog:Jan 14 13:27:37 hathi dhclient: PRC: Prefix
2a01:cb1d:350:d200::/56 depreferred.
/var/log/syslog:Jan 14 13:27:37 hathi dhclient: XMT: Rebind on vlan832,
interval 00ms.
/var/log/syslog:Jan 14 13:27:37 hathi dhclient: Impossible condition at
dhc6.c:268.
/var/log/syslog:Jan 14 13:27:37 hathi dhclient:
/var/log/syslog:Jan 14 13:27:37 hathi dhclient: If you think you have
received this message due to a bug rather
/var/log/syslog:Jan 14 13:27:37 hathi dhclient: than a configuration issue
please read the section on submitting
/var/log/syslog:Jan 14 13:27:37 hathi dhclient: bugs on either our web page
at www.isc.org or in the README file
/var/log/syslog:Jan 14 13:27:37 hathi dhclient: before submitting a bug.
These pages explain the proper
/var/log/syslog:Jan 14 13:27:37 hathi dhclient: process and the information
we find helpful for debugging..
/var/log/syslog:Jan 14 13:27:37 hathi dhclient:
/var/log/syslog:Jan 14 13:27:37 hathi dhclient: exiting.