network-manager loses connection randomly

[Máté Eckl]

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

[Máté Eckl (ecklm)]

It usually happens when the HDD or CPU is extraordinarily busy (eg. copying GB-s of data)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Earendil02 (earendil002)]

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