Hy,
yesterday i found a solution for my similar problem:
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/88746

there is a autosuspend problem with usb2.0 devices
this fixed my problem:

short:
1. Type the following in a terminal window:
sudo gedit /etc/modprobe.d/usb-core-options
2. Add the following line to the usb-core-options file:
options usbcore autosuspend=-1
3. Save your changes, and then type the following in a terminal window:
sudo update-initramfs -u
4. Shutdown and power on your computer. (Don't use the restart option)

-- 
Reset USB High Speed device during reading of the usb Stick 
https://bugs.launchpad.net/bugs/118349
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