Iphone syncing problem (songs get deleted from playlist)?

Every time i sync my iphone 4 to my computer, it messes up my playlists and will either delete it completely or just delete a bunch of songs from the playlist… Can anyone tell me how to fix this? Thanks for the help

Added (1). And now when i just checked all my songs in general, it deleted them… All the songs and stuff are on my computer on itunes but they won't go back on my phone for some reason… I've got the "sync all music" checked too

Sounds to me like you need to make the playlists on your computer and let them transfer from the comp, instead of vice versa

  • Why are some songs not showing up in my playlist on my iPhone 4s? I'm trying to organize my music so I made playlists. I put all the songs I want in the playlist on iTunes, then I go to sync my phone and about half the songs are missing? I tried everything just doesn't make any sense Also I tried to put the songs in the playlist on my phone itself then I sync it with iTunes and just takes the song right back off? This is frustrating anyone have an answer to this problem lemme know please
  • When I updated to ios 9 on my iphone my songs on my itunes playlist got deleted. Why? When I updated to ios 9 on my iphone 5s over half of the songs on my one of my favorite/largest itunes playlists. Why?
  • Syncing a certain playlist to an iPhone 4? I just got an iPhone and I'm trying to add a certain playlist, but my phone keeps trying to add my whole library (which is a LOT of songs I don't want on my phone). I've tried google but they've explained using older versions of iTunes, so that was no help. How can I add my certain playlist w/o my whole library (please be descriptive, I'm new to iTunes!)
  • Problem with syncing iPad and iPhone? I have had my iPad for a while and have synced it to iTunes before and all of the apps for my iPad are in there. Now I have an iPhone and want to sync it to iTunes to be able to charge it with my MacBook, but I don't want to mix my apps, how do I fix this where my iPad and iPhone apps aren't mixing?