I got my iPhone 7+ two weeks ago and I started to use the default music app few days ago. I synced all my music on iTunes to my iPhone and when I was commuting to work, I notice some of my songs don't play from the beginning but starts from the middle of the song and sometimes it end the songs early. I tried close the app and restarting my phone. Some of the songs will go back to normal but then other songs will start ending early or starts midway. All my songs were working perfect fine on my iPod nano. Someone please help :/ I don't know what to do.