Mobile Broadband disconnects. Reboot needed.

[faultygearbox]

My Huawei E220 dongle has started to disconnect every now and then.
   It can run fine for several hours, but suddenly it can disconnect and I cannot connect again no matter what I do (click reconnect, physically disconnect the USB-device and plug it back in).

The only solution is a reboot after which everything is just fine again.

Here's a log that's hopefully around the time of a proper connection of the device followed by disconnection and several attempts to get it connected.

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Sep 22 07:52:52 datir kernel: [41278.440726] usb 4-1: GSM modem (1-port) converter now attached to ttyUSB0
Sep 22 07:52:52 datir kernel: [41278.443424] usb-storage: probe of 4-1:1.1 failed with error -5
Sep 22 07:52:52 datir kernel: [41278.443461] option 4-1:1.1: GSM modem (1-port) converter detected
Sep 22 07:52:52 datir kernel: [41278.443565] usb 4-1: GSM modem (1-port) converter now attached to ttyUSB1
Sep 22 07:52:52 datir kernel: [41278.453698] usb-storage: probe of 4-1:1.2 failed with error -1
Sep 22 08:03:02 datir kernel: [41887.916044] nfs: server 192.168.67.13 not responding, still trying
Sep 22 09:25:41 datir kernel: [46847.120130] usb 4-1: USB disconnect, address 5
Sep 22 09:25:41 datir kernel: [46847.121704] option 4-1:1.0: device disconnected
Sep 22 09:25:41 datir kernel: [46847.122034] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
Sep 22 09:25:41 datir kernel: [46847.122822] option 4-1:1.1: device disconnected
Sep 22 09:25:41 datir kernel: [46847.263531] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
Sep 22 09:25:51 datir kernel: [46857.172039] usb 4-1: new full speed USB device using uhci_hcd and address 6
Sep 22 09:25:51 datir kernel: [46857.331449] usb 4-1: configuration #1 chosen from 1 choice
Sep 22 09:25:51 datir kernel: [46857.373313] usb-storage: probe of 4-1:1.0 failed with error -5
Sep 22 09:25:51 datir kernel: [46857.373354] option 4-1:1.0: GSM modem (1-port) converter detected
Sep 22 09:25:51 datir kernel: [46857.373513] usb 4-1: GSM modem (1-port) converter now attached to ttyUSB0
Sep 22 09:25:51 datir kernel: [46857.400109] usb-storage: probe of 4-1:1.1 failed with error -5
Sep 22 09:25:51 datir kernel: [46857.400148] option 4-1:1.1: GSM modem (1-port) converter detected
Sep 22 09:25:51 datir kernel: [46857.400290] usb 4-1: GSM modem (1-port) converter now attached to ttyUSB1
Sep 22 09:25:51 datir kernel: [46857.407483] usb-storage: probe of 4-1:1.2 failed with error -1
Sep 22 09:45:37 datir kernel: [48043.473347] usb 4-1: USB disconnect, address 6
Sep 22 09:45:37 datir kernel: [48043.474692] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
Sep 22 09:45:37 datir kernel: [48043.474708] option 4-1:1.0: device disconnected
Sep 22 09:45:37 datir kernel: [48043.474925] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
Sep 22 09:45:37 datir kernel: [48043.474937] option 4-1:1.1: device disconnected
Sep 22 09:45:53 datir kernel: [48058.892041] usb 4-1: new full speed USB device using uhci_hcd and address 7
Sep 22 09:45:53 datir kernel: [48059.054140] usb 4-1: configuration #1 chosen from 1 choice
Sep 22 09:45:53 datir kernel: [48059.083097] usb-storage: probe of 4-1:1.0 failed with error -1
Sep 22 09:45:53 datir kernel: [48059.101033] usb 4-1: USB disconnect, address 7
Sep 22 09:45:54 datir kernel: [48059.840050] usb 4-1: new full speed USB device using uhci_hcd and address 8
Sep 22 09:45:54 datir kernel: [48060.003136] usb 4-1: configuration #1 chosen from 1 choice
Sep 22 09:45:54 datir kernel: [48060.017645] usb-storage: probe of 4-1:1.0 failed with error -5
Sep 22 09:45:54 datir kernel: [48060.017669] option 4-1:1.0: GSM modem (1-port) converter detected
Sep 22 09:45:54 datir kernel: [48060.017758] usb 4-1: GSM modem (1-port) converter now attached to ttyUSB0
Sep 22 09:45:54 datir kernel: [48060.124095] usb-storage: probe of 4-1:1.1 failed with error -5
Sep 22 09:45:54 datir kernel: [48060.124117] option 4-1:1.1: GSM modem (1-port) converter detected
Sep 22 09:45:54 datir kernel: [48060.124208] usb 4-1: GSM modem (1-port) converter now attached to ttyUSB1
Sep 22 09:45:54 datir kernel: [48060.173106] usb-storage: probe of 4-1:1.2 failed with error -1
Sep 22 10:15:52 datir kernel: [49858.092081] usb 4-1: USB disconnect, address 8
Sep 22 10:15:52 datir kernel: [49858.093581] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
Sep 22 10:15:52 datir kernel: [49858.093596] option 4-1:1.0: device disconnected
Sep 22 10:15:52 datir kernel: [49858.093810] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
Sep 22 10:15:52 datir kernel: [49858.093823] option 4-1:1.1: device disconnected
Sep 22 10:16:15 datir kernel: [49880.768023] usb 5-1: new full speed USB device using uhci_hcd and address 3
Sep 22 10:16:15 datir kernel: [49880.987153] usb 5-1: configuration #1 chosen from 1 choice
Sep 22 10:16:15 datir kernel: [49880.999079] usb-storage: probe of 5-1:1.0 failed with error -1
Sep 22 10:16:15 datir kernel: [49881.156057] usb 5-1: USB disconnect, address 3
Sep 22 10:16:16 datir kernel: [49881.892028] usb 5-1: new full speed USB device using uhci_hcd and address 4
Sep 22 10:16:16 datir kernel: [49882.055165] usb 5-1: configuration #1 chosen from 1 choice
Sep 22 10:16:16 datir kernel: [49882.080582] usb-storage: probe of 5-1:1.0 failed with error -5
Sep 22 10:16:16 datir kernel: [49882.080602] option 5-1:1.0: GSM modem (1-port) converter detected
Sep 22 10:16:16 datir kernel: [49882.080691] usb 5-1: GSM modem (1-port) converter now attached to ttyUSB0
Sep 22 10:16:16 datir kernel: [49882.090011] usb-storage: probe of 5-1:1.1 failed with error -5
Sep 22 10:16:16 datir kernel: [49882.090029] option 5-1:1.1: GSM modem (1-port) converter detected
Sep 22 10:16:16 datir kernel: [49882.090097] usb 5-1: GSM modem (1-port) converter now attached to ttyUSB1
Sep 22 10:16:16 datir kernel: [49882.099070] usb-storage: probe of 5-1:1.2 failed with error -1
Sep 22 10:17:09 datir kernel: [49934.724743] usb 5-1: USB disconnect, address 4
Sep 22 10:17:09 datir kernel: [49934.728056] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
Sep 22 10:17:09 datir kernel: [49934.728073] option 5-1:1.0: device disconnected
Sep 22 10:17:09 datir kernel: [49934.728282] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
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