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At random times, several time sper day after upgrade from 13.10 to 14.04, my wireless connection gets disconnected and the system log shows:
May  2 13:17:01 Baba-Yaga CRON[18205]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
May  2 13:40:03 Baba-Yaga wpa_supplicant[1553]: wlan0: CTRL-EVENT-DISCONNECTED bssid=d4:ca:6d:57:91:d1 reason=0
May  2 13:40:03 Baba-Yaga NetworkManager[1200]: <info> (wlan0): roamed from BSSID D4:CA:6D:57:91:D1 (Host) to (none) ((none))
May  2 13:40:03 Baba-Yaga NetworkManager[1200]: <info> (wlan0): supplicant interface state: completed -> disconnected
May  2 13:40:03 Baba-Yaga wpa_supplicant[1553]: wlan0: Reject scan trigger since one is already pending
May  2 13:40:03 Baba-Yaga wpa_supplicant[1553]: wlan0: Failed to initiate AP scan

At this point, I will never be able to reconnect to the access point and
after several attempts, the wirless connection is removed from the
NetworkManager applet and the only way to get the wirless connection
back, is to shut down the machine, turn it back on and let it boot. Just
doing a warm reboot will not resolve the issue in many cases. A cold
reboot always will.

This is a Realtek USB based WiFi device and I have used it now for a few
years without issues. Moving the WiFi device to a Windows PC shows that
it works as intended and is never disconnecting or losing connection in
any way.

lsusb shows:
Bus 001 Device 005: ID 0bda:8171 Realtek Semiconductor Corp. RTL8188SU 802.11n WLAN Adapter

$ lsb_release -rd
Description:	Ubuntu 14.04 LTS
Release:	14.04

$ uname -a
Linux Baba-Yaga 3.14.0-031400-generic #201403310035 SMP Mon Mar 31 04:36:23 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Same issue is also present with the default 3.13 kernel.

$ apt-cache policy network-manager
network-manager:
  Installed: 0.9.8.8-0ubuntu7
  Candidate: 0.9.8.8-0ubuntu7
  Version table:
 *** 0.9.8.8-0ubuntu7 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: network-manager 0.9.8.8-0ubuntu7
Uname: Linux 3.14.0-031400-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
Date: Fri May  2 14:04:32 2014
EcryptfsInUse: Yes
ExecutablePath: /usr/sbin/NetworkManager
InstallationDate: Installed on 2014-04-26 (5 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
IpRoute:
 default via 192.168.100.1 dev wlan0  proto static 
 169.254.0.0/16 dev eth0  scope link  metric 1000 
 169.254.136.0/24 dev eth0  proto kernel  scope link  src 169.254.136.2 
 192.168.100.0/24 dev wlan0  proto kernel  scope link  src 192.168.100.162  metric 9
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 LANG=en_US.UTF-8
RfKill:
 
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-con:
 NAME                      UUID                                   TYPE              TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   DBUS-PATH                                 
 Suburban                  069407c8-4892-4a35-ae60-67471e4b941c   802-11-wireless   1399053730   Fri 02 May 2014 02:02:10 PM EDT    yes           no         /org/freedesktop/NetworkManager/Settings/1
 Auto Suburban 1           31b75b94-c201-404c-9b8a-38a3d63fd032   802-11-wireless   0            never                              yes           no         /org/freedesktop/NetworkManager/Settings/0
nmcli-dev:
 DEVICE     TYPE              STATE         DBUS-PATH                                  
 eth0       802-3-ethernet    unmanaged     /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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug trusty
-- 
wlan0 gets disconnected randomly and can not reconnect
https://bugs.launchpad.net/bugs/1315470
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