I'm sorry, but my experience says otherwise. I know that all my Led Zeppilin, Rolling Stones, Mudcrutch, Tom Petty and Red Hot Chili Peppers were on this device (iPad Mini 3) and my iPhone 7, and yet when I looked yesterday, they were in the cloud. Those are simple facts observed by me. This happened, it requires no "understanding" on my part. I saw it. It is plausible that the device locked up and required a restart since the last time I saw this music downloaded, and it is possible that this restart required me to reload that music to my Music Library, but I did not, in any fashion, remove it from my library. Since many seem to have seen this issue, I'm okay with said scenario, but I still feel iOS should alert me to this, so that I, not some software engineer, me, the owner of the music, can choose to correct it immediately or when a network is available rather than discovering ⅓ of my library is missing when I want to listen to it. If I had knowledge that something happened to all the forks in your silverware drawer, wouldn't you want me to pass that on to you before you steak tartar dinner party, or would you rather find out moments before the guests arrived that they would have to eat with their fingers? This should go without saying, and yet, here we are. So my request is simple. Let me know when you first discover this issue. I'll be thankful and I'll correct it in my time. Most importantly, I will not be surprised to find my data gone.