Comment 8 for bug 1293569

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