Media sync and usb device not staying synced

[nemix]

I just got my pre yesterday and decided to put music on it. I tried first through the usb device option, it work but stopped twice and said it couldn't find the song. I disconnected and reconnected and it was fine.

I tried through itunes and it said the same thing when I tried to import a playlist. It did this twice and I noticed I received two textes. Could it ve incoming calls or texts stop the sync?