How old is the Fuze?
As with other electronics that have to hold settings, I believe there is a small separate battery that provides enough power to run the clock, etc. If that battery is dead or has been shaken loose, you’re probably out of luck.
One thing you could try, just for the heck of it, would be to manually replace the firmware. Go to Settings/Info and see whether your hardware is 1.x or 2.x. Put the unit in MSC mode with Settings/System Settings/USB Mode.
Then go to the Firmware Update Link and download the All Regions link for your version. Unzip the file where you can find it (desktop?) and then drag and drop FuzeA.bin onto the driveletter for the unit. Disconnect and let it redo the firmware.
Otherwise, if it’s less than a year old, you’re under warranty and should send it to repair/replace. 1-866-SANDISK
