My iPad 4 running iOS 8.0.x suddenly stopped responding only when in apps. On the home screen taps and gestures work fine.
When I tap any app icon the app launches but doesn't respond to any touches or gestures. This happens to both Apple apps (Settings, etc.) and third-party apps.
The iPad still responds to system gestures though, like four-finger pinch to go to the home screen.
I'm guessing a restart will fix this, but the power button is broken and the iPad is on a full charge. Is there any other way to force a restart?