I have the newest firmware on my zip. I have about ten folder with wav songs and I can play the wav songs from almost all folders but one folder has a problem. When I select the folder and select the option “play all songs” or select the first song or any other songs in this folder the zip jumps from this song to the next song and to the next within a short moment. After the last songs in this folder the zip jumps to the first songs in this folder and everything starts all over again and again until I use the back button and select another folder. In this short moments when the zip jumps from song to song I can’t hear any music and after a few songs the play icon on the screen changes into the pause button but still jumps from song to song. The folder has 12 songs. I have a few others folders with more wav songs in the folder which works fine. I don’t know why this happens in this folder?