Public bug reported:

Once a day my wifi disconnects and there is no way to reconnect to it
via network manager. The only solution is to reboot my PC. I have
changed my router in the last month but the problem still persists.

MY wifi cards is:  Intel Corporation PRO/Wireless 3945ABG [Golan] Network 
Connection 
used driver is: iwl3945

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-generic 4.4.0.96.101
ProcVersionSignature: Ubuntu 4.4.0-96.119-generic 4.4.83
Uname: Linux 4.4.0-96-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  marco      2077 F.... pulseaudio
Date: Fri Sep 29 22:13:29 2017
HibernationDevice: RESUME=UUID=1a9d7c50-5c59-4d68-bc51-1cf714537d97
InstallationDate: Installed on 2017-01-21 (250 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: Acer, inc. Aspire 5920
ProcEnviron:
 LANGUAGE=it
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-96-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-96-generic N/A
 linux-backports-modules-4.4.0-96-generic  N/A
 linux-firmware                            1.157.12
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/15/2007
dmi.bios.vendor: Acer
dmi.bios.version: v1.3708
dmi.board.name: Chapala
dmi.board.vendor: Acer, Inc.
dmi.board.version: Not Applicable
dmi.chassis.type: 1
dmi.chassis.vendor: Acer, Inc.
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnAcer:bvrv1.3708:bd08/15/2007:svnAcer,inc.:pnAspire5920:pvrNotApplicable:rvnAcer,Inc.:rnChapala:rvrNotApplicable:cvnAcer,Inc.:ct1:cvrN/A:
dmi.product.name: Aspire 5920
dmi.product.version: Not Applicable
dmi.sys.vendor: Acer, inc.

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


** Tags: amd64 apport-bug xenial

** Attachment added: "debug.txt"
   https://bugs.launchpad.net/bugs/1720444/+attachment/4958916/+files/debug.txt

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https://bugs.launchpad.net/bugs/1720444

Title:
  wifi suddenly disconnects

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Once a day my wifi disconnects and there is no way to reconnect to it
  via network manager. The only solution is to reboot my PC. I have
  changed my router in the last month but the problem still persists.

  MY wifi cards is:  Intel Corporation PRO/Wireless 3945ABG [Golan] Network 
Connection 
  used driver is: iwl3945

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-generic 4.4.0.96.101
  ProcVersionSignature: Ubuntu 4.4.0-96.119-generic 4.4.83
  Uname: Linux 4.4.0-96-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  marco      2077 F.... pulseaudio
  Date: Fri Sep 29 22:13:29 2017
  HibernationDevice: RESUME=UUID=1a9d7c50-5c59-4d68-bc51-1cf714537d97
  InstallationDate: Installed on 2017-01-21 (250 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  MachineType: Acer, inc. Aspire 5920
  ProcEnviron:
   LANGUAGE=it
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=it_IT.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-96-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-96-generic N/A
   linux-backports-modules-4.4.0-96-generic  N/A
   linux-firmware                            1.157.12
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/15/2007
  dmi.bios.vendor: Acer
  dmi.bios.version: v1.3708
  dmi.board.name: Chapala
  dmi.board.vendor: Acer, Inc.
  dmi.board.version: Not Applicable
  dmi.chassis.type: 1
  dmi.chassis.vendor: Acer, Inc.
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAcer:bvrv1.3708:bd08/15/2007:svnAcer,inc.:pnAspire5920:pvrNotApplicable:rvnAcer,Inc.:rnChapala:rvrNotApplicable:cvnAcer,Inc.:ct1:cvrN/A:
  dmi.product.name: Aspire 5920
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Acer, inc.

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