I Got a new sd card for my new OPTIMUS f3. I created a playlist with the label "Rock". After downloading several songs and moving them to the playlist they all get deleted from the new playlist after a restart or power off. The downloads stay in my player, they just get deleted from the new play list. I have the player that is pre installed with the OPTIMUS f3. Any suggestions of why this happens and how I can fix it? Any help is highly appreciated. Thanks.