As soon as I updated my iPad Air to iOS 8 yesterday I noticed that the gesture to go back to the home screen (five fingers closing) wasn't working. I went to Settings and it was turned on; I turned it off then back on again, and it seemed to resume working. Today when I woke up it wasn't working anymore. At settings, it was still on; I left it alone this time. Later in the day when I tried it, it was working again without me changing anything. Has anyone else experienced weird behaviour with this gesture in iOS 8?