So for some reason spotify undownloaded all of my music and decided to redownload it while I was riding around town on my bike. 2.5 gigabytes of mobile data went the way of the dodo in the space of an hour. I was able to get another gigabyte and I used some of that with other web use, but I still had about 3/4 of a gb. Then earlier I notice that all of my music is undownloaded again. I made sure that it didn't start downloading and streamed music on my way home. Once I got home I started redowloading everything and it used all of my data. While I was on a reliable wifi home connection. I know my Internet didn't go down. I also know that I have spotify set to not download on cellular, yet it did.