Same issue here on a Dell Vostro 1700 with Ubuntu 16.04.

Linux briga-laptop 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:01:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

[ 3125.120019] iwl3945 0000:0c:00.0: Queue 4 stuck for 2500 ms.
[ 3125.120026] iwl3945 0000:0c:00.0: On demand firmware reload
[ 3125.125835] ieee80211 phy0: Hardware restart was requested
[ 3125.173756] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
[ 3125.173761] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
[ 3125.220478] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
[ 3125.220481] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
[ 3125.267181] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
[ 3125.267185] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
[ 3125.313896] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
[ 3125.313900] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
[ 3125.360606] iwl3945 0000:0c:00.0: BSM uCode verification failed at addr 0x00003800+0 (of 900), is 0xa5a5a5a2, s/b 0xf802020
[ 3125.360614] iwl3945 0000:0c:00.0: Unable to set up bootstrap uCode: -5
[ 3125.397069] iwl3945 0000:0c:00.0: Unable to initialize device after 5 attempts.
[ 3125.397077] ------------[ cut here ]------------
[ 3125.397139] WARNING: CPU: 0 PID: 4936 at /build/linux-a2WvEb/linux-4.4.0/net/mac80211/util.c:1818 ieee80211_reconfig+0x1e0/0xf80 [mac80211]()
[ 3125.397141] Hardware became unavailable during restart.
[ 3125.397143] Modules linked in: drbg ansi_cprng ctr ccm binfmt_misc nvidia_uvm(POE) gpio_ich dell_wmi sparse_keymap dell_laptop dcdbas coretemp dell_smm_hwmon kvm_intel kvm irqbypass input_leds serio_raw nvidia(POE) lpc_ich uvcvideo arc4 iwl3945 videobuf2_vmalloc videobuf2_memops iwlegacy videobuf2_v4l2 videobuf2_core joydev snd_hda_codec_hdmi v4l2_common mac80211 videodev r852 sm_common media nand snd_hda_codec_idt snd_hda_codec_generic nand_ecc nand_bch bch snd_hda_intel nand_ids r592 snd_hda_codec mtd cfg80211 memstick snd_hda_core snd_hwdep snd_pcm drm snd_seq_midi snd_seq_midi_event snd_rawmidi wmi mac_hid snd_seq snd_seq_device snd_timer snd soundcore shpchp parport_pc ppdev lp parport autofs4 ses enclosure hid_generic psmouse usbhid hid firewire_ohci firewire_core uas crc_itu_t b44 ssb sdhci_pci
[ 3125.397226]  mii sdhci pata_acpi usb_storage video
[ 3125.397235] CPU: 0 PID: 4936 Comm: kworker/0:2 Tainted: P           OE   4.4.0-36-generic #55-Ubuntu
[ 3125.397238] Hardware name: Dell Inc. Vostro 1700                     /0HX767, BIOS A07 04/21/2008
[ 3125.397261] Workqueue: events_freezable ieee80211_restart_work [mac80211]
[ 3125.397264]  0000000000000286 00000000122297b0 ffff88006c84fcf0 ffffffff813f13b3
[ 3125.397269]  ffff88006c84fd38 ffffffffc0410930 ffff88006c84fd28 ffffffff810810f2
[ 3125.397273]  ffff8800b8c70700 00000000fffffffb ffff8800b8c70700 0000000000000000
[ 3125.397277] Call Trace:
[ 3125.397288]  [<ffffffff813f13b3>] dump_stack+0x63/0x90
[ 3125.397294]  [<ffffffff810810f2>] warn_slowpath_common+0x82/0xc0
[ 3125.397298]  [<ffffffff8108118c>] warn_slowpath_fmt+0x5c/0x80
[ 3125.397325]  [<ffffffffc039b7d4>] ? drv_start+0x44/0x110 [mac80211]
[ 3125.397358]  [<ffffffffc03ccb40>] ieee80211_reconfig+0x1e0/0xf80 [mac80211]
[ 3125.397364]  [<ffffffff8182be32>] ? mutex_lock+0x12/0x30
[ 3125.397389]  [<ffffffffc03981eb>] ieee80211_restart_work+0x6b/0xa0 [mac80211]
[ 3125.397395]  [<ffffffff8109a2c5>] process_one_work+0x165/0x480
[ 3125.397399]  [<ffffffff8109a62b>] worker_thread+0x4b/0x4c0
[ 3125.397403]  [<ffffffff8109a5e0>] ? process_one_work+0x480/0x480
[ 3125.397406]  [<ffffffff8109a5e0>] ? process_one_work+0x480/0x480
[ 3125.397410]  [<ffffffff810a0808>] kthread+0xd8/0xf0
[ 3125.397414]  [<ffffffff810a0730>] ? kthread_create_on_node+0x1e0/0x1e0
[ 3125.397419]  [<ffffffff8182e34f>] ret_from_fork+0x3f/0x70
[ 3125.397422]  [<ffffffff810a0730>] ? kthread_create_on_node+0x1e0/0x1e0
[ 3125.397425] ---[ end trace fba2cc789462e954 ]---
[ 3125.397489] wlp12s0: deauthenticating from f4:f2:6d:98:6d:a4 by local choice (Reason: 3=DEAUTH_LEAVING)
[ 3125.397503] ------------[ cut here ]------------
[ 3125.397526] WARNING: CPU: 0 PID: 4936 at /build/linux-a2WvEb/linux-4.4.0/net/mac80211/driver-ops.h:12 ieee80211_bss_info_change_notify+0x1be/0x1d0 [mac80211]()
[ 3125.397529] wlp12s0:  Failed check-sdata-in-driver check, flags: 0x4
[ 3125.397530] Modules linked in: drbg ansi_cprng ctr ccm binfmt_misc nvidia_uvm(POE) gpio_ich dell_wmi sparse_keymap dell_laptop dcdbas coretemp dell_smm_hwmon kvm_intel kvm irqbypass input_leds serio_raw nvidia(POE) lpc_ich uvcvideo arc4 iwl3945 videobuf2_vmalloc videobuf2_memops iwlegacy videobuf2_v4l2 videobuf2_core joydev snd_hda_codec_hdmi v4l2_common mac80211 videodev r852 sm_common media nand snd_hda_codec_idt snd_hda_codec_generic nand_ecc nand_bch bch snd_hda_intel nand_ids r592 snd_hda_codec mtd cfg80211 memstick snd_hda_core snd_hwdep snd_pcm drm snd_seq_midi snd_seq_midi_event snd_rawmidi wmi mac_hid snd_seq snd_seq_device snd_timer snd soundcore shpchp parport_pc ppdev lp parport autofs4 ses enclosure hid_generic psmouse usbhid hid firewire_ohci firewire_core uas crc_itu_t b44 ssb sdhci_pci
[ 3125.397597]  mii sdhci pata_acpi usb_storage video
[ 3125.397605] CPU: 0 PID: 4936 Comm: kworker/0:2 Tainted: P        W  OE   4.4.0-36-generic #55-Ubuntu