Why downloaded music keeps deleting off an iPhone?

Sometimes when I add new music into my phone (not from iTunes app) my older music would delete itself now I keep getting a pop up saying 31 items can't sync check iTunes but I don't know what to do and I can't put the music back into my phone

Can someone help please

It is illegal. Itunes / Apple recognise it is not actually bought so they will delete your music.

When you have set your phone and iTunes to SYNC, it will bump off OLD music to make room for new. I have everything on MANUAL - I'm in control - and frankly, I carry SO MUCH music that I use a separate mp3 player with cards. No issues - again, I'm in control.

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