Fuze won't finish playing song

Why don’t you try reinstalling the firmware? That might help. Keep in mind that there is a difference between the V1 Fuze and the V2, so you will need to instal the firmware for you device.

Also, do you have copies of your songs, videos, pictures, and whatever else on your computer? If so, then perhaps you could reformat the device and recopy everything. That might help.