VideoPlayer has a native bug which causes it, to loose its width and height attributes when the user cancels FullScreen mode.
A workaround is to capture the event and re-enter the player attributes as follows:
Listening to the FULL_SCREEN event at the systemManager
var event = e.fullScreen;
and if it is about to close I re-enter the percentages for the player height and width, and it again works as expected.
I hope this helps someone….