You have been subscribed to a public bug:
When connected to a 5GHz (802.11ac) WPA2 wireless network with UFW firewall
enabled at system startup , I experience intermittent issues where the Wi-Fi
completely disconnects and the 5G network is no longer displayed in the list of
Wi-Fi Networks.
Toggling the "Enable Wi-Fi" option resets the Wi-Fi and allows the user to
reconnect.
The latest A10 firmware version is installed on the laptop.
I confirmed that the 5G network was still up and running , so the issue is most
likely not on the router network end.
I have no custom firewall rules that would cause this behaviour , but I do see
a lot of multicast address resolution requests being blocked in the ufw logs.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.2.0-35-generic 4.2.0-35.40~14.04.1
ProcVersionSignature: Ubuntu 4.2.0-35.40~14.04.1-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Apr 18 18:32:30 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-03-03 (45 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
SourcePackage: linux-lts-wily
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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5GHz Wi-Fi Intermittently Disconnects on Dell Latitude 3340
https://bugs.launchpad.net/bugs/1571882
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