A* Pathfinding - Path Cancels when multiple enemies spawn?!

Hi,

I'm making a game for a project at School that is due Friday and I am having some issue with regards to the pathfinding algorithm I'm using.

The algorithm works great when there is only 1 Enemy, it follows the player constantly and works very efficiently. However, one issue I am having is that when I spawn multiple instances of the enemy, with the pathfinding script and the seeker script, after around 1-2 seconds, they all stop pathfinding and the path cancels?!

Could I have some insight as to how to fix this please.

Thanks Very Much!

public class EnemyAIBasic : MonoBehaviour {

 public Transform target;
 public GameObject Character;
 public float updateRate = 2f;
 Animator anim;

 private Seeker seeker;
 private Rigidbody2D rb2d;

 public Pathfinding.Path path;

 public float speed = 300f;
 public ForceMode2D fMode;

 [HideInInspector]
 public bool pathIsEnded = false;

 public float nextWaypointDist = 3f;

 private int currentWaypoint = 0;

 void Start() {

     Character = GameObject.FindGameObjectWithTag ("Char");
     target = Character.transform;


     seeker = GetComponent<Seeker> ();
     rb2d = GetComponent<Rigidbody2D> ();

     if (target == null) {
         UnityEngine.Debug.LogError ("No player found.");

         return;
     }

     seeker.StartPath (transform.position, target.position, OnPathComplete);

     //StartCoroutine (UpdatePath ());
 
 }


 void FixedUpdate(){
     
     //target = Character.transform;

     if (target == null) {
         
         return;
     }

     if (path == null) {

         return;
     }

     if (currentWaypoint >= path.vectorPath.Count) {
         if (pathIsEnded)
             return;

         UnityEngine.Debug.Log ("End of path reached.");
         pathIsEnded = true;
         return;



     }

     pathIsEnded = false;

     Vector3 dir = (path.vectorPath [currentWaypoint] - transform.position).normalized;
     dir *= speed * Time.fixedDeltaTime;
     


     rb2d.AddForce (dir, fMode);
     
     float dist = Vector3.Distance (transform.position, path.vectorPath [currentWaypoint]);

     if (dist < nextWaypointDist) {
             currentWaypoint++;

     }



 }

 IEnumerator UpdatePath (){

     if (target == null) {
         yield return false;
     }

     seeker.StartPath (transform.position, target.position, OnPathComplete);
     yield return new WaitForSeconds (1f / updateRate);
     StartCoroutine (UpdatePath());


 }

 public void OnPathComplete(Pathfinding.Path p){

     UnityEngine.Debug.Log ("We got a path. Was there an Error?" + p.error);

     if (!p.error) {
         path = p;
         currentWaypoint = 0;
     }



 }

}