I encountered a bug which drives me insane. Sometimes, maybe once a week, the following occurs: 1) I leave an active app (which is in a folder) with a tap on the Home button 2) I am in the folder 3) I can't open another app in the folder. I touch the icons but nothing happens. I tap the Home button to leave the folder. 4) I am now on the Home screen, but I am not able to open another app (not Mail / Safari) 5) The Mail / Safari app is greyed out 6) Nothing works anymore, neither the Home button nor the Control Center. iOS is frozen. 7) I have to reboot the phone. It happened to me on my 6s with iOS 11.0, 11.0.1 and 11.1. Every time I made a clean install. It didn't help. Now I'm on my 8 Plus and I encounter this bug every week at least once. Has anyone else experienced a similar issue and found a resolution? I once was able to make a screenshot (this was the only thing that worked). Mail wasn't active before, it was "killed".