coconjs button freeze

[skywalker]

i made a simple on game controller for a game when test it with coconjs it sometimes freezes and not responding to touch specially on slow devices
then it works and so on 

 

            this.sprite.events.onInputDown.add(function(){

 

                console.log("down")

                if (GAME.paused == false) {

                    this.sprite.alpha = 1;

                    this.pressed = true;

                };

                

            }, this);

 

            this.sprite.events.onInputUp.add(function(){

 

                if (GAME.paused == false) {

                    this.sprite.alpha = 0.35;

                    this.pressed = false;

                };

                

            }, this);

 

and they are fixed to camera