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[Tony Espy <1425987@xxxxxxxxxxxxxxxxxx>]

So it looks you indeed have hit #1418077.

This is pretty obvious by looking in the attached nmlog file, and search
for connection '/208150102671184/context1'.  You'll see it get disabled
at 18:41:24 after a bunch of failed attempts ( modem-no-carrier ).  It
gets successfully auto-activated again in +5m.

That said, I also see something else that concerns me.

If you look at the netlog, after '/208150102671184/context1' is
disabled, you'll see NM try a 'context3', 'context5', and 'context1'
again.  The odd thing is that the related IMSI is not '208150102671184'
it's '208103698221268'.   Looking at network-test-session.log ( also
attached ), you'll see that '208150102671184' is the IMSI for ril_0, and
that ril_1 is PIN-locked.   It appears to me that NM may be trying
contexts from other SIM directories it finds in /var/lib/ofono/.

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https://bugs.launchpad.net/bugs/1425987

Title:
  Cellular data connection stops after a while

Status in network-manager package in Ubuntu:
  Incomplete

Bug description:
  current build number: 122
  device name: krillin
  channel: ubuntu-touch/devel-proposed
  alias: ubuntu-touch/vivid-proposed
  last update: 2015-02-25 15:06:29
  version version: 122
  version ubuntu: 20150225
  version device: 20150210-95b6a9f
  version custom: 20150225

  Test Case:
  1. Disable Wifi
  2. Verify that a cellular data connection is established
  3. Wait...

  Actual result
  After a while (several minutes) the cellular data connection stops, eventually it'll come back but not always.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.10.0-4ubuntu6
  Uname: Linux 3.4.67 armv7l
  ApportVersion: 2.16.1-0ubuntu2
  Architecture: armhf
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Thu Feb 26 16:14:14 2015
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   # Include files from /etc/network/interfaces.d:
   source-directory /etc/network/interfaces.d
  InstallationDate: Installed on 2015-02-25 (1 days ago)
  InstallationMedia: Ubuntu Vivid Vervet (development branch) - armhf (20150225-020204)
  IpRoute:
   
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=false
   WWANEnabled=true
   WimaxEnabled=true
  PciNetwork:
   
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  mtime.conffile..etc.dbus.1.system.d.org.freedesktop.NetworkManager.conf: 2015-02-25T03:31:54
  nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

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