Wifi stops working but doesn't disconnect

[Vitor]

OK, I have this bug apparently since the 13.04, and I decided not to complain about it or report it because I was about to upgrade to 13.10 (Saucy, which I'm using now) and I thought the problem have already been found and might be fixed in the new version.
But that didn't happened... I'm upgraded to 13.10 and still have the bug.

That's what happened and I'll try to make it as clear as possible (this is my first bug report and I want it to be the best as possible).
Also, sorry for bad English; that's not my mother-language.

So, sometimes, when I'm using the internet, the wifi connection just stops working.
The connection stills ON (connected to my wifi router) but doesn't download or upload, get or send any data. No application can reach the internet when the bug happens.
The bug is more noticeable when I'm using Chromium browser. I'm trying to see a website or a page, but the Chromium keeps loading (in the inferior left bar shows "solving hosts" or something like that), and the loading takes some seconds until Chromium shows a error message in the tab.
But this bug not only happens when using Chromium or Nightly or any other browser. It's permanent and happens anytime. Sometimes it happens when using browsers, in the middle of downloads (by browser and by torrent), in the middle of update or upgrade, or even when I'm not using the internet at all. I open Hedgewars or the OpenOffice Writer and then, when I close the application and try to use the internet, it just doesn't work.
The connection stills on, Ubuntu stills connected to the wifi router.

But there's another interesting fact: when I disconnect and connect, the internet back working again. No speed limits or any other bugs (until it happens again, since this bug is persistent; it happens many times per day. Disconnect and connect works always when it happens).

I verified the internet with Windows 7 and Windows 8 and nothing happened. It's not hardware problem, it's Ubuntu bug, indeed.

And even another interesting fact: this bug happened twice while I was writing this bug report!

Apparently, there's no time period that this bug appears (like... each 5 minutes, or each 1 hour). It happens in no scheduled time, the time for this to happen is totally random (APPARENTLY -- I never made an official time-counting by clock or anything such).

I already talked about this bug in askubuntu.com and I saw one person experiencing this same bug (only one person, but... stills being an annoying bug for those who have it).

As asked, here are the release of Ubuntu and the version of the suspected package (used "sudo apt-cache policy network-manager"):

Ubuntu 13.10 Saucy (as said before) and:

vitor@vitor-N150P:~$ sudo apt-cache policy network-manager
[sudo] password for vitor:
network-manager:
  Instalado: 0.9.8.0-0ubuntu22
  Candidato: 0.9.8.0-0ubuntu22

Thanks in advance for the help and thank you, Canonical, for keeping Ubuntu the best operational system I ever had (not only the free ones!).

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: network-manager 0.9.8.0-0ubuntu22
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Mon Nov 25 01:37:11 2013
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2013-11-05 (19 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
IpRoute:
 default via 192.168.0.1 dev eth1 proto static
 192.168.0.0/24 dev eth1 proto kernel scope link src 192.168.0.156 metric 9
MarkForUpload: True
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 LANGUAGE=pt_BR:pt:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-con:
 NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY DBUS-PATH
 Conexão cabeada 1 723548a2-9ed6-4567-b5e5-decd0eaaf7e0 802-3-ethernet 1385349506 Seg 25 Nov 2013 01:18:26 BRST yes no /org/freedesktop/NetworkManager/Settings/2
 MONI d8804f36-881b-4ca1-ad92-6e52267e077b 802-11-wireless 1385350706 Seg 25 Nov 2013 01:38:26 BRST yes no /org/freedesktop/NetworkManager/Settings/1
 dlink 928fdc87-6144-4dd2-a3c6-6a8278499ad6 802-11-wireless 1385326533 Dom 24 Nov 2013 18:55:33 BRST yes no /org/freedesktop/NetworkManager/Settings/0
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 eth0 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/1
 eth1 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
 running 0.9.8.0 connected enabled enabled enabled enabled disabled

[Isaac Church (quadraq)]

How do I get the fix?