DPF(LCD Display) automatic reattach question

I use the lcd4linux on Iomega HMNHD-CE ( Debian squeeze is installed, not the original firmware ).

I use transmission to download file, download speed is 20MB/s, In the downloading process, when transmission CPU occupancy is high it is easy to appear USB LCD display automatic off-line and reattach.

When the USB device reattach, device will be assigned an new address. When the redistribution of the address exceeds the limit, there will be attach failure. must to restart the machine for reattach this device.

some dmesg log info:

[12202.720000] usb 1-2: new full speed USB device using oxnas-ehci and address 4
[12217.840000] usb 1-2: device descriptor read/64, error -110
[12233.070000] usb 1-2: device descriptor read/64, error -110
[12233.300000] usb 1-2: new full speed USB device using oxnas-ehci and address 5
[12248.420000] usb 1-2: device descriptor read/64, error -110
[12263.650000] usb 1-2: device descriptor read/64, error -110
[12263.880000] usb 1-2: new full speed USB device using oxnas-ehci and address 6
[12274.300000] usb 1-2: device not accepting address 6, error -110
[12274.420000] usb 1-2: new full speed USB device using oxnas-ehci and address 7
[12284.840000] usb 1-2: device not accepting address 7, error -110
[12284.840000] hub 1-0:1.0: unable to enumerate USB device on port 2
[12345.740000] usb 1-2: new high speed USB device using oxnas-ehci and address 8
[12345.890000] usb 1-2: configuration #1 chosen from 1 choice
[12345.890000] scsi2 : SCSI emulation for USB Mass Storage devices
[12345.910000] usb-storage: device found at 8
[12345.910000] usb-storage: waiting for device to settle before scanning
[12350.910000] scsi 2:0:0:0: Direct-Access     USBest   USB2FlashStorage 0.00 PQ: 0 ANSI: 2
[12350.920000] usb-storage: device scan complete
[12350.920000] sd 2:0:0:0: [sdb] 2048000 512-byte logical blocks: (1.04 GB/1000 MiB)
[12350.930000] sd 2:0:0:0: [sdb] Write Protect is off
[12350.940000] sd 2:0:0:0: [sdb] Mode Sense: 00 00 00 00
[12350.940000] sd 2:0:0:0: [sdb] Assuming drive cache: write through
[12350.950000] sd 2:0:0:0: [sdb] Assuming drive cache: write through
[12350.950000]  sdb: sdb1
[12351.100000] sd 2:0:0:0: [sdb] Assuming drive cache: write through
[12351.110000] sd 2:0:0:0: [sdb] Attached SCSI removable disk
[12371.900000] usb 1-2: USB disconnect, address 8
[12424.470000] usb 1-2: new full speed USB device using oxnas-ehci and address 9
[12439.590000] usb 1-2: device descriptor read/64, error -110

USB LCD display reattach failure but usb-storage success.
Another success reattach dmesg log:

[20793.980000] usb 1-2: USB disconnect, address 2
[20794.290000] usb 1-2: usbfs: usb_submit_urb returned -19
[20795.180000] usb 1-2: new full speed USB device using oxnas-ehci and address 3
[20795.360000] usb 1-2: configuration #1 chosen from 1 choice
[21688.580000] usb 1-2: usbfs: process 12098 (lcd4linux) did not claim interface 0 before use

lcd4linux log info:

lcd4linux.c: got signal 1
lcd4linux.c: leaving main loop
DPF: shutting down.
drv_dpf.c: closing connection
lcd4linux.c: restarting...

Try using udev rule http://forum.doozan.com/read.php?9,9915,10788#msg-10788