USB GSM modem crash - help needed

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I am having problems with a USB GSM modem (ZTE MF110).

When plugged in, the device registers as SCSI CDROM (19d2:2000). When
"eject"ed, it registers as a GSM modem (19d2:0031) with three associated
devices: /dev/ttyUSB{0,1,2}.

Well into a ppp connection (4-5 hours), the connection to the 3g uplink
sometimes dies and all three devices unregister. A new USB device
(19d2:0016) registers with associated /dev/ttyUSB0. The modem remains
unoperational until it is physically removed and re-plugged. At the time
of the problem my logs show a series of "XactErr len 0/4096" type messages
but ppp's logs show no special control packets being sent (logs attached
below).

System specs: udev 168 and kernel 3.3.6. Modem uses usbserial & usb_wwan
kernel modules. Connection established with ppp 2.4.5 and link helper 
wvdial or chat.

Would greatly appreciate help and suggestions on how to further debug and
identify the source of the problem.

~ Andy

ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 1
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 2
hub 1-0:1.0: state 7 ports 5 chg 0000 evt 0004
ehci_hcd 0000:02:07.2: GetStatus port:2 status 001002 0  ACK POWER sig=se0 CSC
hub 1-0:1.0: port 2, status 0100, change 0001, 12 Mb/s
usb 1-2: unregistering device
usb 1-2: unregistering interface 1-2:1.0
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 3
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 4
usb 1-2: unregistering interface 1-2:1.1
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 5
usb 1-2: unregistering interface 1-2:1.2
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 6
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 7
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 8
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 9
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 10
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 11
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 12
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 13
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 14
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 15
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 16
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 17
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 18
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 19
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 20
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 21
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 22
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 23
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 24
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 25
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 26
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 27
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 28
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 29
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 30
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 31
ehci_hcd 0000:02:07.2: devpath 2 ep5in 3strikes
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 1
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 2
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 3
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 4
ehci_hcd 0000:02:07.2: detected XactErr len 0/64 retry 1
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 5
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 6
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 7
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 8
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 9
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 10
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 11
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 12
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 13
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 14
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 15
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 16
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 17
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 18
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 19
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 20
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 21
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 22
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 23
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 24
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 25
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 26
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 27
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 28
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 29
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 30
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 31
ehci_hcd 0000:02:07.2: devpath 2 ep5in 3strikes
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 1
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 2
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 3
usb 1-2: unregistering interface 1-2:1.3
usb 1-2: unlink qh2-0001/cfe52f80 start 1 [2/0 us]
ehci_hcd 0000:02:07.2: shutdown urb d3901c80 ep4in-intr
ehci_hcd 0000:02:07.2: detected XactErr len 0/4096 retry 4
ehci_hcd 0000:02:07.2: shutdown urb d3901f80 ep5in-bulk
ehci_hcd 0000:02:07.2: shutdown urb d3901980 ep5in-bulk
usb 1-2: usb_disable_device nuking all URBs
Script /etc/ppp/ip-down started (pid 18143)
Script /etc/ppp/ip-down finished (pid 18143), status = 0x0
hub 1-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x100
hub 1-0:1.0: state 7 ports 5 chg 0000 evt 0004
ehci_hcd 0000:02:07.2: GetStatus port:2 status 001803 0  ACK POWER sig=j CSC CONNECT
hub 1-0:1.0: port 2, status 0501, change 0001, 480 Mb/s
hub 1-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x501
ehci_hcd 0000:02:07.2: port 2 high speed
ehci_hcd 0000:02:07.2: GetStatus port:2 status 001005 0  ACK POWER sig=se0 PE CONNECT
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 1
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 2
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 3
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 4
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 5
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 6
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 7
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 8
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 9
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 10
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 11
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 12
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 13
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 14
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 15
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 16
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 17
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 18
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 19
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 20
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 21
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 22
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 23
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 24
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 25
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 26
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 27
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 28
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 29
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 30
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 31
ehci_hcd 0000:02:07.2: devpath 2 ep0in 3strikes
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 1
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 2
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 3
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 4
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 5
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 6
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 7
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 8
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 9
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 10
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 11
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 12
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 13
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 14
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 15
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 16
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 17
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 18
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 19
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 20
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 21
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 22
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 23
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 24
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 25
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 26
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 27
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 28
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 29
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 30
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 31
ehci_hcd 0000:02:07.2: devpath 2 ep0in 3strikes
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 1
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 2
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 3
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 4
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 5
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 6
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 7
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 8
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 9
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 10
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 11
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 12
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 13
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 14
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 15
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 16
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 17
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 18
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 19
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 20
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 21
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 22
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 23
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 24
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 25
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 26
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 27
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 28
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 29
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 30
ehci_hcd 0000:02:07.2: detected XactErr len 0/8 retry 31
ehci_hcd 0000:02:07.2: devpath 2 ep0in 3strikes
ehci_hcd 0000:02:07.2: port 2 high speed
ehci_hcd 0000:02:07.2: GetStatus port:2 status 001007 0  ACK POWER sig=se0 PE CSC CONNECT
hub 1-0:1.0: state 7 ports 5 chg 0000 evt 0004
ehci_hcd 0000:02:07.2: GetStatus port:2 status 003802 0  ACK POWER OWNER sig=j CSC
hub 1-0:1.0: port 2, status 0100, change 0001, 12 Mb/s
hub 1-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x100
hub 5-0:1.0: state 7 ports 2 chg 0000 evt 0002
ohci_hcd 0000:02:07.1: GetStatus roothub.portstatus [0] = 0x00010101 CSC PPS CCS
hub 5-0:1.0: port 1, status 0101, change 0001, 12 Mb/s
hub 5-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x101
ohci_hcd 0000:02:07.1: GetStatus roothub.portstatus [0] = 0x00100103 PRSC PPS PES CCS
ohci_hcd 0000:02:07.1: GetStatus roothub.portstatus [0] = 0x00100103 PRSC PPS PES CCS
usb 5-1: default language 0x0409
usb 5-1: udev 3, busnum 5, minor = 514
usb 5-1: usb_probe_device
usb 5-1: configuration #1 chosen from 1 choice
usb 5-1: adding 5-1:1.0 (config #1, interface 0)
option 5-1:1.0: usb_probe_interface
option 5-1:1.0: usb_probe_interface - got id
drivers/usb/core/inode.c: creating file '003'
hub 5-0:1.0: state 7 ports 2 chg 0000 evt 0002
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