On Sun, 29 Jul 2012, shaiju shaiju wrote:

> Hi  Alan,
> 
> Here  is  the  full  log  .  During  a  reboot   the  usb  device  is
> enumerated  in  High speed (480 Mb/s) .  The  it  change  status  to  full
> Speed (12 Mb/s)   followed  by  a  disconnect  .  After  this  the  device
> is  again  enumerated  back in   High speed .

This happened because the device got into some sort of error state.  
Perhaps its firmware crashed.  If you collect a usbmon trace, that 
might give a clue as to the reason.

Alan Stern

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