遊戲人物停止移動

我創建了我的第一個統一的遊戲，我有一個敵人角色，從左上角移動到右側完全正常，但後來我有一個預製（該字符的複印件）那突然停止移動，但是當我拿起他與位置工具角色開始再次移動，然後再次停止。我正在使用Unity 5.2.3f1版本。遊戲人物停止移動

下面是我使用

public class EnemyPatrol : MonoBehaviour { 

    public float moveSpeed; 
    public bool moveRight; 

    public float wallCheckRadius; 
    public Transform wallCheck; 
    public LayerMask whatIsWall; 
    private bool hittingWall; 

    private bool notAtEdge; 
    public Transform edgeCheck; 

    // Use this for initialization 
    void Start() { 

    } 

    // Update is called once per frame 
    void Update() { 
     //GetComponent<Rigidbody2D>().velocity=new Vector2(3,0); 
     //Debug.Log("Premikam se desno "+GetComponent<Rigidbody2D>().velocity); 

     //hittingWall = Physics2D.OverlapCircle (wallCheck.position, wallCheckRadius, whatIsWall); 
     wallCheckRadius = 0.6f; 
     notAtEdge = Physics2D.OverlapCircle (edgeCheck.position, wallCheckRadius, whatIsWall); 


     hittingWall = false; 
     //notAtEdge = true; 
     if (hittingWall || !notAtEdge) { 
      moveRight = !moveRight; 
      Debug.Log ("Zadene steno " + hittingWall + " Ni na robu " + notAtEdge); 
     } 
     // Prepreci krozenje igralca (zabavna zadeva) 
     GetComponent<Rigidbody2D>().constraints = RigidbodyConstraints2D.FreezeRotation; 

     if (moveRight) { 
      transform.localScale = new Vector3 (1f, 1f, 1f); 
      GetComponent<Rigidbody2D>().velocity=new Vector2(3,0); 
      Debug.Log("Premikam se desno "+GetComponent<Rigidbody2D>().velocity); 
     } else { 
      transform.localScale = new Vector3 (-1f, 1f, 1f); 
      GetComponent<Rigidbody2D>().velocity=new Vector2(-3,0); 
      Debug.Log("Premikam se levo"+GetComponent<Rigidbody2D>().velocity); 
     } 
    } 
}

的代碼，這是它的外觀在遊戲中的畫面。