Hello ! I use the last iOS 9 beta on my iPhone 5S. I noticed that sometimes my battery seems to drain really really if I don't plug the phone overnight. For example, this night I went from 95% battery to 20% when I woke up. The Battery usage in the setting app tells me that Facebook have 10 hours of background activity, even though I have disabled background activité for almost every app, including facebook, long ago (and just checked and they still are disabled). I was wondering, is this a known bug in the BETA ?