This

    wpa_supplicant[4035]: WPA: Group rekeying completed with
00:0f:a3:1c:a0:8b [GTK=TKIP]

seems to be what causes DHCP renewal (every 30 seconds!!) subsequently
to fail.

** Summary changed:

- wireless disconnects due to failed lease renewal
+ Wi-Fi disconnects after failed DHCP lease renewal due to TKIP rekeying

** Changed in: network-manager (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/387162

Title:
  Wi-Fi disconnects after failed DHCP lease renewal due to TKIP rekeying

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