Huawei E398 modem won't reconnect until unplug and plug in

[Christopher Forster]

Hi, when Network Manager had disconnected I was not able to use the modem. I had to unplug the modem, plug in the modem and it connected. I have a Huawei E398 4G USB modem. I'm using Ubuntu 12.04 beta2.
sudo lsusb -v | grep Huawei
Bus 001 Device 005: ID 12d1:1506 Huawei Technologies Co., Ltd. E398 LTE/UMTS/GSM Modem/Networkcard
  idVendor 0x12d1 Huawei Technologies Co., Ltd.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: network-manager 0.9.3.995+git201203152001.04b2a74-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-20.33-generic-pae 3.2.12
Uname: Linux 3.2.0-20-generic-pae i686
ApportVersion: 1.95-0ubuntu1
Architecture: i386
CheckboxSubmission: e28f23d40ba6960d2759044b1acbd380
CheckboxSystem: c69722ecac764861be52925fa50b4dcc
Date: Mon Apr 16 21:04:30 2012
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120328)
IpRoute:

NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=false
 WWANEnabled=true
 WimaxEnabled=true
ProcEnviron:
 LANGUAGE=se_NO:nb_NO:nb:no_NO:no:nn_NO:nn:da:sv:en
 TERM=xterm
 LANG=se_NO
 SHELL=/bin/bash
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: yes
  Hard blocked: no
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)