Random movement and "move to spot" trouble

1

This script is supposed to refresh mine location by deleting older mines and shooting new ones every 25 seconds or so. But for some reason after the 3rd mine, the mines don’t move at all… I’m sure its a small script issue but…I don’t see it…

btw.
_root.faceMe is the enemy…


for (h=0; h<2; h++) {
            turret4 = _root["turret4"+h];
            mineTime++;
            if (mineTime>=25) {
                mineTime = 0;
                mine = attachMovie("mine", "mine_"+_root.getNextHighestDepth(), _root.getNextHighestDepth(), {_x:turret4._x, _y:turret4._y});
                mineCount++;
                mine._rotation = 0+Math.random()*360;
                mine.swapDepths(turret3);
                mine.swapDepths(turret2);
                mine.swapDepths(turret1);
                trace(mineCount);
                mine.onEnterFrame = function() {
                    xspeed4 = speed4*Math.sin(this._rotation*(Math.PI/180));
                    yspeed4 = speed4*Math.cos(this._rotation*(Math.PI/180))*-1;
                    this._x += xspeed4;
                    this._y += yspeed4;
                    speed4 -= .3;
                    if (speed4<=0) {
                        speed4 = 0;
                    }
                    if (this._x>550 || this._x<0 || this._y>400 || this._y<0) {
                        unloadMovie(this);
                    }
                    distance4 = 150;
                    if (Math.sqrt((this._x-turret4._x)*(this._x-turret4._x)+(this._y-turret4._y)*(this._y-turret4._y))>distance4) {
                        unloadMovie(this);
                    }
                    if (this.hitTest(_root.faceMe)) {
                        unloadMovie(this);
                        attachMovie("explosion", "explosion_"+_root.getNextHighestDepth(), _root.getNextHighestDepth(), {_x:this._x, _y:this._y});
                    }
                };
            }
        }