Changing the orientation of app flickers for few seconds

I have created a responsive Ionic 3 app to support both portrait and landscape orientations. It works perfectly, however unlike native app the full dimension app is not rotating instead it shows half the screen and after a few seconds it cover the whole landscape view and vice versa for portrait view.TMwZU%20(1)TMwZU%20(1)

ANybody please help me to resove this…

Please anybody reply