Sansa Fuze turns screen off when i do something Please Help!!

If you really think it is firmware related–which seems unlikely since a whole lot of people have that firmware installed without a problem–you could try going back to previous firmware.

You’ll have to do it manually. 

Go to the firmware sticky, and click on the All Regions link for your unit (v1 or v2). Copy the link into your browser. It will end with the number for the current version. (.31, I think).  Put your cursor there, change the last digits to .26, and that’s where SanDisk has the old versions stashed.

You’ll get a zipped file. Unzip it on your desktop and drag-and-drop fuzeA.bin onto the driveletter of your Fuze (where Windows Explorer shows X: Sansa Fuze). Disconnect, and you’ll have the old firmware back.