My songs won't play anymore on my iPhone?

My songs that are not purchased have never had a problem playing on my iPhone 4S until recently whenever I would try to play them they would skip right past the songs and would automatically delete off my phone. The songs are still in my iTunes library and I've synced it many times but they won't go back on my phone

Added (1). I haven't deleted anything recently this all just started happening the other day out of no where. I've tried deleting the songs and reinstalling them but it still won't move over to my phone

I know what you speaking about, did you delete anything off of your iphone lately? If so, you have deleted the music cache or cookie. Generally when we download any file, there's also a cache attached. (A digital file), that the device would understand, so the music can be played and heard. And the iphone is deleting the song, because it probably was designed to delete any file that is no longer accessible to it, so i suggest, you download the musical file over again, and be careful not to delete the cache next time

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