Yes, seeing this too on 15.10 since around the first week of March, as
best I can tell, but irrespective of Suspend.

It looks like dhclient thinks/is told the new lease is 'depreferred' and
therefore quits, and the dhclient process is terminated, but the address
remains on the interface until the valid-lifetime expires.

Mar 22 16:06:02 hephaestion NetworkManager[1468]: <info>  Activation (wlp3s0) 
Beginning DHCPv6 transaction (timeout in 45 seconds)
Mar 22 16:06:02 hephaestion NetworkManager[1468]: <info>  dhclient started with 
pid 19221
Mar 22 16:06:03 hephaestion dhclient: XMT: Confirm on wlp3s0, interval 950ms.
Mar 22 16:06:03 hephaestion dhclient: RCV: Reply message on wlp3s0 from 
fe80::ee43:f6ff:fe46:c080.
Mar 22 16:06:03 hephaestion dhclient: message status code Success.
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>    valid_lft 86400
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>    preferred_lft 86400
Mar 22 16:06:03 hephaestion dhclient: PRC: Rebinding lease on wlp3s0.
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>    address 
2a02:8011:2007::2
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>    nameserver 
'2a02:8010:1:0:212:23:3:100'
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>  (wlp3s0): DHCPv6 
state changed unknown -> bound
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>  Policy set 
'wireless.lan.iam.tj' (wlp3s0) as default for IPv6 routing and DNS.
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>  Writing DNS 
information to /sbin/resolvconf
Mar 22 16:06:03 hephaestion dnsmasq[2433]: setting upstream servers from DBus
Mar 22 16:06:03 hephaestion dnsmasq[2433]: using nameserver 
2a02:8010:1:0:212:23:3:100#53
Mar 22 16:06:03 hephaestion dnsmasq[2433]: using nameserver 10.254.1.254#53
Mar 22 16:06:03 hephaestion nm-dispatcher: Dispatching action 'dhcp6-change' 
for wlp3s0
Mar 22 16:06:03 hephaestion dhclient: PRC: Address 2a02:8011:2007::2 
depreferred.
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>  (wlp3s0): DHCPv6 
state changed bound -> unknown
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>  (wlp3s0): DHCPv6 
state changed unknown -> expire
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>  (wlp3s0): canceled 
DHCP transaction, DHCP client pid 19221
Mar 22 16:06:03 hephaestion NetworkManager[1468]: <info>  (wlp3s0): DHCPv6 
state changed expire -> done

$ ip -6 addr show dev wlp3s0
3: wlp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 2a02:8011:2007::2/128 scope global dynamic 
       valid_lft 82942sec preferred_lft 82942sec
    inet6 fe80::21f:3bff:febd:7485/64 scope link 
       valid_lft forever preferred_lft forever

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1533631

Title:
  Failed to renew DHCPv6 lease after suspend

Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  After fixing IPv6 address assignment (#1469346), IPv6 works fine until
  sleep. On wake up ubuntu fails to renew its IPv6 lease:

  Jan 13 10:47:47 ubuntu dhclient: PRC: Renewing lease on wlp3s0.
  Jan 13 10:47:47 ubuntu dhclient: PRC: Rebinding lease on wlp3s0.
  Jan 13 10:47:47 ubuntu dhclient: XMT: Rebind on wlp3s0, interval 9890ms.
  Jan 13 10:47:47 ubuntu NetworkManager[796]: <info>  (wlp3s0): DHCPv6 state 
changed bound -> unknown
  Jan 13 10:47:47 ubuntu dhclient: PRC: Address 2a02:xxxx:xxxx:xxxx::b44 
depreferred.
  Jan 13 10:47:47 ubuntu NetworkManager[796]: <info>  (wlp3s0): DHCPv6 state 
changed unknown -> expire
  Jan 13 10:47:47 ubuntu NetworkManager[796]: <info>  (wlp3s0): canceled DHCP 
transaction, DHCP client pid 1170
  Jan 13 10:47:47 ubuntu NetworkManager[796]: <info>  (wlp3s0): DHCPv6 state 
changed expire -> done

  I'm not sure that it's solely NetworkManager issue (dhclient could
  also be affected).

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