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[Adrian Chapman <adrian@xxxxxxxxxxxxxxxxxxxxxxx>]

Exactly the same being seen here, frequently.

Vivid 15.04, upgraded on release from 14.10 (previously upgraded several times)
Intel 3945ABG using iwl3945
Dell Latitude D830

deauthenticating by local choice message in dmesg, followed by a dozen
or so lines of "Failed check-sdata-in-driver check, flags: 0x4" all
timestamped within 0.01 seconds.

Check network-manager - networks all shown. Turn wireless hardware switch off, all go. Back on, all stay gone.
Restart network-manager - "Wi-Fi Networks: device not ready"

Under 14.10, on first booting the machine, it would always associate
with a weaker wireless network, and need manually changing to the
stronger. This never happened prior to 14.10, and doesn't happen under
15.04

Time before failure can be several days, or (as this morning) can be
~20min after boot. It can fail to resume, or it can happen whilst the
machine's in use. I think I've had it a dozen or so times since upgrade.

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https://bugs.launchpad.net/bugs/1408963

Title:
  [Xbuntu 14.04, 14.10 and 15.04] Network manager stops working: iwl3945
  0000:03:00.0: BSM uCode verification failed at addr ...; wlan0:
  deauthenticating from... by local choice (Reason: 3=DEAUTH_LEAVING),

Status in linux-firmware package in Ubuntu:
  Confirmed
Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  From time to time, the system loses all wireles networks and kubuntu
  network manager applet goes blank - not even one network is shown. All
  wifi connections are broken. Rebooting fixes the issue, switching to
  WICD on-the-fly enables to continue browsing without rebooting, so it
  seems to be no hardware issue or iwl3945 issue.

  What to expect: stable connections and flawless network managing.
  What happens: so above.

  Further informations about the system, the network configuration, the
  package version can be found in the attachment, also parts of rsyslog
  and dmesg.

  Interesting, according to some helpers, are the following lines:
  dmesg:   wlan0: deauthenticating from 02:26:4d:ac:8f:45 by local choice (Reason: 3=DEAUTH_LEAVING)

  lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 14.10
  Release:        14.10
  Codename:       utopic

  apt-cache policy network-manager
  network-manager:
    Installiert:           0.9.8.8-0ubuntu28
    Installationskandidat: 0.9.8.8-0ubuntu28
    Versionstabelle:
   *** 0.9.8.8-0ubuntu28 0
          500 http://de.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages
          100 /var/lib/dpkg/status

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