Hi there. So I just bought my lumia 920 less than a month ago (I'm in Indonesia, by the way). After about three days, I sync it with my laptop (windows 7) using "Windows Phone app for desktop", and put some musics and other stuff in it. I tried to play some songs after the sync, and everything was fine. Until today I realized, when I tried to play a song, the phone gave an error message: :Sorry, we're not able to play this file in your phone. Error Code: 80040154". This happens to all of the songs. How does this happen? I also remember when I did the sync, some files just couldn't be copied and the phone restarted by itself. I thought it was not a big deal, besides I was able to play some musics aftermath (although there was 1-2 albums were failed to be copied), so I thought there was no problem. What can I do to fix this problem? I tried google and found nothing helpful. Thanks.
Ary