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[Nate <nathanlesko@xxxxxxxxx>]

Got it working by downgrading modemmanager as described here
http://ubuntuforums.org/showthread.php?t=2239564

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https://bugs.launchpad.net/bugs/1373116

Title:
  cdc_acm causes Pantech UML295 reset

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  When I upgraded to 14.04 (3.13 kernel), the Pantech UML295 4G Modem
  stopped functioning properly.

  Expected behavior:
      The modem starts up with a red LED lit while it initialized.  Once a connection is established, linux recognizes a USB ethernet connection (cdc_ether), and the LED on the device goes green and flashing, indicating active connection.  This status remains until the device is disconnected.

  Observed behavior:
      The modem starts up normally, getting to the point that a cdc_ether device is set up and a working internet connection is established.  Shortly after this, the modem's light goes blue (an LED color that the documentation shows no information for), the ethernet connection fails, and the device goes back to the beginning of its initialization.  The process will repeat indefinitely.

  This behavior can be avoided, and a connection maintaned, by
  blacklisting cdc_acm.  However, this breaks many other USB serial
  devices.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  charlie    1799 F.... pulseaudio
   /dev/snd/controlC0:  charlie    1799 F.... pulseaudio
   /dev/snd/pcmC0D0c:   charlie    1799 F...m pulseaudio
  CurrentDesktop: X-Cinnamon
  Date: Tue Sep 23 16:16:04 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-09-04 (18 days ago)
  InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: LENOVO Lenovo IdeaPad P580
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-35-generic.efi.signed root=/dev/mapper/sysvg-lvroot ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/14/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 5ECN96WW(V9.01)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 00000000INVALID
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad P580
  dmi.modalias: dmi:bvnLENOVO:bvr5ECN96WW(V9.01):bd03/14/2013:svnLENOVO:pnLenovoIdeaPadP580:pvrLenovoIdeaPadP580:rvnLENOVO:rnINVALID:rvr00000000INVALID:cvnLENOVO:ct10:cvrLenovoIdeaPadP580:
  dmi.product.name: Lenovo IdeaPad P580
  dmi.product.version: Lenovo IdeaPad P580
  dmi.sys.vendor: LENOVO

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