Same problem,  from syslog:

Jun 12 23:07:45 jero-laptop kernel: [68448.600100] iwl3945 0000:04:00.0: Queue 
0 stuck for 2500 ms.
Jun 12 23:07:45 jero-laptop kernel: [68448.600111] iwl3945 0000:04:00.0: On 
demand firmware reload
Jun 12 23:07:45 jero-laptop kernel: [68448.605882] ieee80211 phy0: Hardware 
restart was requested
Jun 12 23:07:45 jero-laptop kernel: [68448.653834] iwl3945 0000:04:00.0: BSM 
uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.653840] iwl3945 0000:04:00.0: Unable 
to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.700559] iwl3945 0000:04:00.0: BSM 
uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.700564] iwl3945 0000:04:00.0: Unable 
to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.747278] iwl3945 0000:04:00.0: BSM 
uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.747284] iwl3945 0000:04:00.0: Unable 
to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.794010] iwl3945 0000:04:00.0: BSM 
uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.794014] iwl3945 0000:04:00.0: Unable 
to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.840731] iwl3945 0000:04:00.0: BSM 
uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5
a5a5a2, s/b 0xf802020
Jun 12 23:07:45 jero-laptop kernel: [68448.840737] iwl3945 0000:04:00.0: Unable 
to set up bootstrap uCode: -5
Jun 12 23:07:45 jero-laptop kernel: [68448.878678] iwl3945 0000:04:00.0: Unable 
to initialize device after 5 attempts.
Jun 12 23:07:45 jero-laptop kernel: [68448.878686] ------------[ cut here 
]------------
Jun 12 23:07:45 jero-laptop kernel: [68448.878734] WARNING: CPU: 0 PID: 16738 
at /build/buildd/linux-3.19.0/net/mac80211/util.c:1774 ieee8021
1_reconfig+0x47d/0x1480 [mac80211]()
Jun 12 23:07:45 jero-laptop kernel: [68448.878737] Hardware became unavailable 
during restart.
Jun 12 23:07:45 jero-laptop kernel: [68448.878740] Modules linked in: rfcomm 
bnep nls_iso8859_1 uas usb_storage nfnetlink_queue nfnetlink_log
 nfnetlink pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ctr 
ccm binfmt_misc nls_utf8 nvidia(POE) uvcvideo videobuf2_vmalloc
 videobuf2_memops btusb videobuf2_core v4l2_common videodev bluetooth media 
coretemp arc4 kvm snd_hda_codec_hdmi iwl3945 iwlegacy snd_hda_codec_realtek 
mac80211 snd_hda_codec_generic pcmcia snd_hda_intel snd_hda_controller joydev 
snd_hda_codec serio_raw lpc_ich snd_hwdep cfg80211 yenta_socket drm tifm_7xx1 
pcmcia_rsrc snd_pcm tifm_core pcmcia_core snd_seq_midi snd_seq_midi_event 
toshiba_acpi snd_rawmidi sparse_keymap snd_seq wmi snd_seq_device snd_timer snd 
irda soundcore crc_ccitt 8250_fintek toshiba_bluetooth shpchp mac_hid cuse nfsd 
parport_pc ppdev auth_rpcgss nfs_acl lp lockd grace sunrpc parport autofs4 
psmouse pata_acpi sdhci_pci firewire_ohci sdhci firewire_core r8169 crc_itu_t 
mii video
Jun 12 23:07:45 jero-laptop kernel: [68448.878836] CPU: 0 PID: 16738 Comm: 
kworker/0:1 Tainted: P        W  OE  3.19.0-18-generic #18-Ubuntu
Jun 12 23:07:45 jero-laptop kernel: [68448.878839] Hardware name: TOSHIBA 
Satellite A200/ISKAE, BIOS V1.80 08/21/2007
Jun 12 23:07:45 jero-laptop kernel: [68448.878858] Workqueue: events 
ieee80211_restart_work [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.878862]  00000000 00000000 c4cdfe44 
c16e9c0d c4cdfe88 c4cdfe78 c10616db f9503b1c
Jun 12 23:07:45 jero-laptop kernel: [68448.878870]  c4cdfea4 00004162 f95038e0 
000006ee f94c5b5d 000006ee f94c5b5d f042902c
Jun 12 23:07:45 jero-laptop kernel: [68448.878878]  fffffffb f04283e0 c4cdfe90 
c1061743 00000009 c4cdfe88 f9503b1c c4cdfea4
Jun 12 23:07:45 jero-laptop kernel: [68448.878887] Call Trace:
Jun 12 23:07:45 jero-laptop kernel: [68448.878897]  [<c16e9c0d>] 
dump_stack+0x41/0x52
Jun 12 23:07:45 jero-laptop kernel: [68448.878904]  [<c10616db>] 
warn_slowpath_common+0x8b/0xc0
Jun 12 23:07:45 jero-laptop kernel: [68448.878930]  [<f94c5b5d>] ? 
ieee80211_reconfig+0x47d/0x1480 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.878955]  [<f94c5b5d>] ? 
ieee80211_reconfig+0x47d/0x1480 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.878961]  [<c1061743>] 
warn_slowpath_fmt+0x33/0x40
Jun 12 23:07:45 jero-laptop kernel: [68448.878986]  [<f94c5b5d>] 
ieee80211_reconfig+0x47d/0x1480 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.878993]  [<c16ed290>] ? 
mutex_lock+0x10/0x30
Jun 12 23:07:45 jero-laptop kernel: [68448.879013]  [<f94a2287>] ? 
ieee80211_scan_cancel+0x97/0x190 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.879031]  [<f949819d>] 
ieee80211_restart_work+0x3d/0x80 [mac80211]
Jun 12 23:07:45 jero-laptop kernel: [68448.879037]  [<c10761b0>] ? 
pwq_dec_nr_in_flight+0x40/0x90
Jun 12 23:07:45 jero-laptop kernel: [68448.879041]  [<c1077ad2>] 
process_one_work+0x122/0x3a0
Jun 12 23:07:45 jero-laptop kernel: [68448.879046]  [<c1078479>] 
worker_thread+0x39/0x4d0
Jun 12 23:07:45 jero-laptop kernel: [68448.879051]  [<c109a10f>] ? 
__wake_up_locked+0x1f/0x30
Jun 12 23:07:45 jero-laptop kernel: [68448.879056]  [<c1078440>] ? 
rescuer_thread+0x320/0x320
Jun 12 23:07:45 jero-laptop kernel: [68448.879061]  [<c107c61b>] 
kthread+0x9b/0xb0
Jun 12 23:07:45 jero-laptop kernel: [68448.879067]  [<c16efa81>] 
ret_from_kernel_thread+0x21/0x30
Jun 12 23:07:45 jero-laptop kernel: [68448.879072]  [<c107c580>] ? 
kthread_create_on_node+0x150/0x150
Jun 12 23:07:45 jero-laptop kernel: [68448.879075] ---[ end trace 
49aeaa507623cb50 ]---
Jun 12 23:07:45 jero-laptop kernel: [68448.879094] wlan0: deauthenticating from 
c4:27:95:88:90:00 by local choice (Reason: 3=DEAUTH_LEAVING)

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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),

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