Lumia Cyan music playlist keeps being deleted after few hours

[Dimble]

So I have updated to Lumia Cyan (Lumia 1020) and after I hard reset, I added all my music to my Lumia 1020. Then there is now an option to create a playlist so I added the music to a playlist. After running all through the check boxes to choose what music to get in to the playlist, it was saved and was playing smoothly. I did the playlist last night. Morning came, I went out, when I choose the playlist, it says nothing. The music are not there anymore. In fact, i was listening to it before i get to sleep. What is happening to this native Music app in Lumia Cyan update?

Can anyone help me please?