I have been using the USB port for my modem connection a long time, but recently I had this problem where the USB link on the modem would turn off abruptly and the only way to restore the connection was to re-boot the computer. This happened irrespective of the number of USB ports used. I had the feeling, there is something wrong with the USB cable, since my 2 external hard-disk were working fine with all the ports. Even changing the USB cable did not have any effect, and then the Technical officer at the local BSNL office told me, that the USB connection of modem to computer is fairly less stable than ethernet. Is this true??