game.input.activePointer.isDown PROBLEM IE

[i3Designer]

I used game.input.activePointer.isDown for my game, but only in IE on Windows Phone i have a little problem, the problem is that while i press the screen, after a few second the input is false, why? 

CODE

 

in update: 

        if(game.input.activePointer.isDown){

            this.sposta();

        }

 

function out update:

 

    sposta: function(){

        if(game.device.desktop){

        }

        else{

            if(game.input.x < 280){        //sinistra

                this.tab.body.rotation += 0.045;

            }

            else if(game.input.x > 280){    //destra

                this.tab.body.rotation -= 0.045;   

            }

        }   

    },