my android app some times display half of the screen only when maximize

Question

I am using the scale-mode, alignment and aspect-ratio like this in flash cs6.

stage.scaleMode = StageScaleMode.EXACT_FIT;

stage.align = StageAlign.TOP_LEFT;

Aspect Ratio : landscape

When my app is maximized(after minimize) some times it will display half of the screen only. In some devices user logged out.