Problem with draggable movieclip

Hello guys!

Well, i have an issue with some startDrag objects.

I am using this code:

botaoProblemas.onPress = function() {
this.startDrag();
};

botaoProblemas.onRelease = function() {
botoes(this);
};

function botoes(mc:MovieClip) {
mc.stopDrag();
//more random stuff
}

problem is:

1 - Sometimes i just cant target it, no idea why (i imported the Ai files and then just hit F8 and make it a movieclip)

2 - Sometimes, when i press the movieclip goes to strange coordinate