This looks more likely to be a kernel (driver) issue, reassigning.

** Package changed: network-manager (Ubuntu) => linux-lts-wily (Ubuntu)

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  5GHz Wi-Fi Intermittently Disconnects on Dell Latitude 3340

Status in linux-lts-wily package in Ubuntu:

Bug description:
  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 

  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 

  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 
  SourcePackage: linux-lts-wily
  UpgradeStatus: No upgrade log present (probably fresh install)

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