I'm from Spain and started having this very problem one year ago, just one year and a half, aprox., after buying it new. I've tried by my own some of the suggestions given here, even not having read them before: replacing and recharging battery, cleaning battery contacts, formating Hi-MD Disc and transfering again music into it. It's really annoying this behaviour because it's absolutely unexpected and random. You can have a nice playing for a whole day and the next one you can despair with this resets while playing for 30 minutes at least. I have to try these two new suggestions and I'll write here my experience. Thanks!
