128gb iphone 6s on ATT. I've had to reboot/restart (Hold home and power button) 6 times today already. Sometimes its just freezes on lock screen and other times it freezes when unlocked and in an app or on a "page" of apps. I don't know if anyone else has this but its really annoying. I'm guessing its a background app causing it or something so i've killed all apps in background for now except downcast. Just wondering if anyone else has this.