The frozen app syndrome is a frustrating condition that causes your iPhone, iPad and iPod to suddenly seize up, forcing you to do a full restart because even your home button has stopped working.
Well here’s a 2 step guide to help you get out of this situation:
Press and hold the power button on the top right corner of your iPhone, iPad, iPod until you see the shutdown screen. All iPhone, iPod Touch, and iPad power buttons are on the upper right corner (if you’re facing the screen).
Now you should be seeing the shutdown screen below. Next step is to press and hold the home button. Keep holding it until frozen app closes and you see your home screen.
That’s it! Your app is now closed, feel free to go back to using your iDevice.