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[Thibauld <tfavre@xxxxxxxxx>]

I just got a disconnection, here is what syslog has to say about it:

Apr 30 12:53:06 thibauld-desktop wpa_supplicant[815]: message repeated 47 times: [ wlan0: CTRL-EVENT-SCAN-STARTED ]
Apr 30 12:54:54 thibauld-desktop wpa_supplicant[815]: wlan0: CTRL-EVENT-DISCONNECTED bssid=cc:35:40:57:80:e1 reason=4 locally_generated=1
Apr 30 12:54:54 thibauld-desktop NetworkManager[699]: <warn> Connection disconnected (reason -4)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.692842] cfg80211: Calling CRDA to update world regulatory domain
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695285] cfg80211: World regulatory domain updated:
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695288] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695290] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695292] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695293] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695294] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695295] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: completed -> disconnected
Apr 30 12:54:54 thibauld-desktop wpa_supplicant[815]: wlan0: CTRL-EVENT-SCAN-STARTED 
Apr 30 12:54:54 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: disconnected -> scanning
Apr 30 12:54:58 thibauld-desktop wpa_supplicant[815]: wlan0: SME: Trying to authenticate with cc:35:40:57:80:e1 (SSID='Math Network' freq=2462 MHz)
Apr 30 12:54:58 thibauld-desktop kernel: [14263.454497] wlan0: authenticate with cc:35:40:57:80:e1
Apr 30 12:54:58 thibauld-desktop kernel: [14263.456106] wlan0: send auth to cc:35:40:57:80:e1 (try 1/3)
Apr 30 12:54:58 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: scanning -> authenticating
Apr 30 12:54:58 thibauld-desktop wpa_supplicant[815]: wlan0: Trying to associate with cc:35:40:57:80:e1 (SSID='Math Network' freq=2462 MHz)
Apr 30 12:54:58 thibauld-desktop kernel: [14263.460143] wlan0: authenticated
Apr 30 12:54:58 thibauld-desktop kernel: [14263.463419] wlan0: associate with cc:35:40:57:80:e1 (try 1/3)
Apr 30 12:54:58 thibauld-desktop kernel: [14263.466334] wlan0: RX AssocResp from cc:35:40:57:80:e1 (capab=0x411 status=0 aid=5)
Apr 30 12:54:58 thibauld-desktop kernel: [14263.467056] wlan0: associated
Apr 30 12:54:58 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: authenticating -> associating
Apr 30 12:54:58 thibauld-desktop wpa_supplicant[815]: wlan0: Associated with cc:35:40:57:80:e1
Apr 30 12:54:58 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: associating -> associated
Apr 30 12:54:58 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: associated -> 4-way handshake
Apr 30 12:54:59 thibauld-desktop wpa_supplicant[815]: wlan0: WPA: Key negotiation completed with cc:35:40:57:80:e1 [PTK=CCMP GTK=TKIP]
Apr 30 12:54:59 thibauld-desktop wpa_supplicant[815]: wlan0: CTRL-EVENT-CONNECTED - Connection to cc:35:40:57:80:e1 completed [id=0 id_str=]
Apr 30 12:54:59 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: 4-way handshake -> completed
Apr 30 12:55:06 thibauld-desktop wpa_supplicant[815]: wlan0: CTRL-EVENT-SCAN-STARTED 
Apr 30 12:57:40 thibauld-desktop dbus[616]: [system] Activating service name='org.debian.apt' (using servicehelper)
Apr 30 12:57:40 thibauld-desktop AptDaemon: INFO: Initializing daemon
Apr 30 12:57:40 thibauld-desktop dbus[616]: [system] Successfully activated service 'org.debian.apt'
Apr 30 12:57:40 thibauld-desktop AptDaemon.PackageKit: INFO: Initializing PackageKit compat layer
Apr 30 12:58:48 thibauld-desktop dbus[616]: [system] Activating service name='org.debian.AptXapianIndex' (using servicehelper)
Apr 30 12:58:48 thibauld-desktop dbus[616]: [system] Successfully activated service 'org.debian.AptXapianIndex'

Hope this helps!
PS: I forgot to say in my previous comment that my Ubuntu 14.04 runs on a 4th Gen NUC Core i5-4250U D54250WYK

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Packages, which is subscribed to linux-firmware in Ubuntu.
https://bugs.launchpad.net/bugs/1293569

Title:
  iwlwifi-7260-8.ucode causes network disconnections problems

Status in “linux-firmware” package in Ubuntu:
  Confirmed

Bug description:
  Running 14.04 (beta) with Kernel 3.13.0-17-generic

  I've encountered a strange and reproducible error with the
  iwlwifi-7260-8.ucode firmware.

  This laptop is a Dell XPS 12 (haswell). With the -8 firmware, it will
  connect fine to wifi for 30 or 40 mins at a time, then will start
  dropping connections repeatedly. Even modprobe -r unloading and
  reloading doesn't fix the issue, only a reboot will temporarily solve
  it for 40 mins at a time.

  Moreover, here is what's strange, is during these episodes of
  disconnection it seems to affect the actual router (2Wire), as the
  other devices in the house will also start to have issues (very slow
  connections, limited range,etc).  Once I reboot this laptop everything
  and all devices will return to normal.

  This issue has been fixed by me manually removing the -8 firware from
  /lib/firmware and letting the -7 firmware load instead. Since that has
  been done there has not been a single issue of this happening (now
  going on 4 days).

  let me know if there is any other information you would like me to
  provide.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-firmware 1.126
  ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
  Uname: Linux 3.13.0-17-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Mar 17 08:13:25 2014
  Dependencies:
   
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-03-07 (9 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140307)
  PackageArchitecture: all
  SourcePackage: linux-firmware
  UpgradeStatus: No upgrade log present (probably fresh install)

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