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[Earendil02 <earendil002@xxxxxxxxx>]

It happens to me too, randomly it disconnects and it isn't able to reconnect until I run this custom script:
sudo rmmod iwldvm ; sleep 3 ; sudo modprobe iwldvm
Then it automatically reconnects.
I have a dell XPS13 native ubuntu, running Ubuntu 14.04 LTS

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https://bugs.launchpad.net/bugs/1323418

Title:
  network-manager loses connection randomly

Status in “network-manager” package in Ubuntu:
  Confirmed

Bug description:
  It started a few weeks ago when network-manager started to lose connection randomly. Before these few weeks it sometimes happened after wake-up from suspend, but now I don't even have to suspend to experience this issue. It just suddenly seem to lose the signal of my home wi-fi network and I can only reconnect it after restarting network manager. I'm almost sure about not having problem with the router because after losing signal I can still see my printer's hotspot, and if I connect it after a few minutes that connection breaks too.
  In the first weeks of my fresh ubuntu 14.04 install this issue didn't happen (only a few times after wakeup as I've mentioned, but).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: network-manager 0.9.8.8-0ubuntu7
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon May 26 22:49:56 2014
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2014-04-20 (36 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  IpRoute:
   default via 192.168.1.100 dev wlan0  proto static 
   192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.105  metric 9
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH                                  
   CC:8C:E3:37:E8:6C bluetooth         disconnected  /org/freedesktop/NetworkManager/Devices/2  
   eth0       802-3-ethernet    unavailable   /org/freedesktop/NetworkManager/Devices/1  
   wlan0      802-11-wireless   connected     /org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN      
   running         0.9.8.8    connected       enabled       enabled         enabled    enabled         disabled

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