Jimi

Do these work for a E005F??

Hi everyone, have a really strange problem my new NW-E005F, i transfer a .WAV to my mp3 player and sonic stage converts it and thats fine but i play the song on my e005F and it plays for about 5-10 secs then a error comes up say "CANNOT PLAY" but if i skip past the first 20 secs or so it doesnt do it and the rest of the song plays fine!!! this is totally bizarre