My zune is acting up.. it says file is missing or cannot be played.. and it skips like 10 songs in a row?

whats up with that.. i have the 80g black one.. i have had it for 3 months.. i never had any problem with it before a couple days ago.. do i need to reset it? if so how? if anyone knows how to fix this or why its like that let me know please.. thanks you
Update: how do i reset or restore it?
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