iPhone stopped working
I'm currently using iPhone 5 with iOS 9.2.1 . And whenever I accidentally pressed the notification centre on the assestive touch, my phone would just stop working in that apps. For example, I'm using Instagram, and i pressed te notificatio centre on the assistive touch, I can't go to homepage or others apps. but when i lock my screen, it just goes black but my siri, i can hear ringtone when people calling me. And this until I pressed home button and lock screen button only then become back to normal. But it comes again when I pressed It again. It happens to me two times today. how to solve this?