Same problem. Dmesg in attachment, system information below.
> sudo dmidecode -t 1 | egrep -v "Serial Number|UUID"
# dmidecode 2.12
SMBIOS 2.4 present.
Handle 0x0001, DMI type 1, 27 bytes
System Information
Manufacturer: LENOVO
Product Name: 1951PSG
Version: ThinkPad T60
Wake-up Type: Power Switch
SKU Number: Not Specified
Family: ThinkPad T60
> lsb_release -rd
Description: Ubuntu Wily Werewolf (development branch)
Release: 15.10
** Attachment added: "dmesg-wifi-failure.txt"
https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1408963/+attachment/4413008/+files/dmesg-wifi-failure.txt
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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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