Songs removed from playlist after syncing
I have an iPhone 6 and prefer to mainly use my iPhone to purchase music (rather than using my Mac)
I only connect my iPhone to my laptop once a month, however during my last couple of syncs to my Mac, in many of my playlists that I have created; songs have been removed, yet they are still in my iTunes library, I now have to go back and manually add the songs back into the playlists.
I would like to know how to fix this issue so that I don't have to manually add the songs when I sync my phone and stopped it happening altogether.
iPhone 6, iOS 8.3, null