Your iPhone could be deleting songs stored in it due to a corrupt operating system or iTunes. If you upgraded to iOS5 this has been known to be an issue and it can be remedied by reinstalling the upgrade with the recommended settings.
1 year ago
Last edited at 5:55PM on 3/29/2012
your iphone itune app genius thing snatch and checksum if your .mp3 files are legit or not. if they are not they are deleted. Apple is the new Darpa toy. IBM got dumped... Time to buy cheap lenovo thinkpads!!!
I had the same issue. Then redownload any song. You will then be able to swipe right to left and delete any song. You can then disable "Show All Music" and the swipe to delete will still work. http://goo.gl/JsJmRu