Yesterday approximately 5,000 songs disappeared from the Music app on my iPhone 6 Plus. I was listening to a downloaded song, while surfing Facebook, and the song stopped. When I went to the Music app to restart it, my entire library and all my playlists were gone. This was not only downloaded songs, but also ones added to my music but not downloaded. The Settings app reported there were no songs on my iPhone, yet the available memory did not increase. I had WiFi off at work, and resetting the iPhone did not solve the problem. The Music app still had me signed in, as the "For You" section still showed suggestions. When I got home, I turned WiFi back on, and the Music app then showed all my playlists and songs added to My Music, but nothing was "made available for offline use". I began downloading songs, which takes forever. I opened iTunes on my Mac, and took a look at what it said was on my iPhone, and realized the Music app was now downloading duplicate songs, apparently couldn't see the songs that were still on the iPhone. In frustration, I wiped the iPhone (full reset), started from scratch. I first reinstalled all my apps, and set up everything. Then I opened the Music app, which again showed all the songs and playlists in My Music, but none were downloaded. I selected the "Purchased Music" playlist, about 3,100 songs, and let it run all night while the iPhone was plugged in. In the morning it had only downloaded about 1,800 songs, and had failed to download a great many songs saying they were no longer available, or couldn't be downloaded at this time. I turned off WiFi when I went to work, and the iPhone kept trying to download the songs even though I have the preferences set NOT to download music or apps on Cellular Data. This ran my battery down, and continued to interrupt me with alerts it couldn't download a song. The iPhone resumed downloading songs when I returned home and turned WiFi back on. I took a nap and was happy to see it had now successfully downloaded almost all the remaining songs. The Settings app indicated it had also downloaded 20+ videos. I went into the video section of the Music app, showing the ones available on the iPhone, and deleted most of them. I then examined one artist which the app had downloaded 4 albums. The first one was missing some songs, so I had it display the entire album, and tagged it to make the songs available for offline use. Then over 2,000 downloaded songs disappeared from the iPhone. WTF !!!!!!!!!! The Settings app showed 544 songs on the iPhone. iTunes on my Mac showed only 12 songs on the iPhone. I signed out of the Music app, signed back in, and now it shows only 12 songs on the iPhone. The Settings app now shows 13 songs on the iPhone. I am so frustrated by this experience. I am an Apple fanboy, and cannot believe this is happening.