How to duplicate AI in the same map?

Getting Started
1

As you can see in the video. If I duplicate them so all of the new AI is going to be freezing.

This is my code that using for these AI.

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class chase : MonoBehaviour {

    public Transform player;
    static Animator anim;

    public Slider healthbar;


    void Start ()

    {
        anim = GetComponent<Animator>();
    }
  
  
    void Update ()

    {
        if (healthbar.value <= 0) return;

        Vector3 direction = player.position - this.transform.position;
        float angle = Vector3.Angle(direction, this.transform.forward);
        if (Vector3.Distance(player.position, this.transform.position) < 10 && angle <160)
        {
          
            direction.y = 0;
            this.transform.rotation = Quaternion.Slerp(this.transform.rotation,
                Quaternion.LookRotation(direction), 0.5f);

            anim.SetBool("isIdle", false);
            if (direction.magnitude > 1)
            {
                this.transform.Translate(0, 0, 0.02f);
                anim.SetBool("isWalking", true);
                anim.SetBool("isAttacking", false);
            }
            else
            {
                anim.SetBool("isAttacking", true); ;
                anim.SetBool("isWalking", false);
            }

        }
        else

        {
            anim.SetBool("isIdle", true);
            anim.SetBool("isWalking", false);
            anim.SetBool("isAttacking", false);

        }
    }
}

Sorry for my bad English.

2

Just remove all of the statics