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I am using ubuntu 13.04 for last 4 months and for vodafone USB broadband i was using Sakis3g for connecting. Yesterday USB dongle stopped during working and after that sakis3g was unable to connect. After rebooting every thing was ok. But the problem repeated again. system log shows the below message.

Aug 30 21:21:24 akhilesh-Lenovo-G580 modem-manager[1145]: <info>  (ttyACM0) closing serial port...
Aug 30 21:21:24 akhilesh-Lenovo-G580 modem-manager[1145]: <info>  (ttyACM0) serial port closed
Aug 30 21:21:24 akhilesh-Lenovo-G580 modem-manager[1145]: <info>  (ttyACM1) closing serial port...
Aug 30 21:21:24 akhilesh-Lenovo-G580 modem-manager[1145]: <info>  (ttyACM1) serial port closed
Aug 30 21:21:24 akhilesh-Lenovo-G580 modem-manager[1145]: <info>  (tty/ttyACM0): released by modem /sys/devices/pci0000:00/0000:00:14.0/usb3/3-2
Aug 30 21:21:24 akhilesh-Lenovo-G580 modem-manager[1145]: <info>  Modem /org/freedesktop/ModemManager/Modems/0: state changed (connected -> disabled)
Aug 30 21:21:24 akhilesh-Lenovo-G580 NetworkManager[1339]: <info> (wwan0): device state change: activated -> unmanaged (reason 'removed') [100 10 36]
Aug 30 21:21:24 akhilesh-Lenovo-G580 NetworkManager[1339]: <info> (wwan0): deactivating device (reason 'removed') [36]
Aug 30 21:21:24 akhilesh-Lenovo-G580 kernel: [ 5487.265301] usb 3-2: USB disconnect, device number 3
Aug 30 21:21:24 akhilesh-Lenovo-G580 kernel: [ 5487.268881] cdc_ether 3-2:1.5 wwan0: unregister 'cdc_ether' usb-0000:00:14.0-2, Mobile Broadband Network Device

Please help me.

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