i purchased last month
same problem in Win7 sp1 x64,
in another SOs has no problem…
i use a utility to clean the regedit of unused usb devices called DriveCleanup
i unplug & apply this program, after reboot…
the pendrive only work one time, must respeat this, ■■■■■…
maybe the problem is caused by a strain update of windows (WPD)??
in this case we need a firmware update, tried to get support too
please sandisk, fix it this horrible problem!
thanks, modma