Re-enabling a script OnTriggerExit

I have an enemy in my scene that when colliding with a slime gameobject on the ground, will have his script disabled, this works fine.

When the slime disappears though, I would like to re-enable his script so he can continue doing his thing. This only works 50% of the time though, the other times, the script will not re-enable and he continues to be stuck.

Anyone know what I'm overlooking here? Thanks

 using UnityEngine;
 using System.Collections;
 
 public class SwarmBehaviour : MonoBehaviour
 {
     private Animator animate;
     private NavMeshAgent agent;
 
     public float distance;
 
     private Transform target; //the enemy's target 
 
     float moveSpeed = 3; //move speed 
     float rotationSpeed = 3; //speed of turning
 
     private Transform myTransform; //current transform data of this enemy
     public Vector3 finalPosition;
 
     private Rigidbody rb;
 
     void Awake()
     {
         myTransform = transform; //cache transform data for easy access/preformance 
     }
 
     // Use this for initialization
     void Start()
     {
         target = GameObject.FindWithTag("Caecus").transform; //target the player
         animate = GetComponent<Animator>();
         agent = GetComponent<NavMeshAgent>();
         InvokeRepeating("RandomPosition", 0.0f, 5.0f);
         rb = GetComponent<Rigidbody>();
     }
 
     // Update is called once per frame
     void Update()
     {
         distance = Vector3.Distance(myTransform.position, target.transform.position);
 
         if (distance < 10)
         {
             agent.enabled = false;
             
             animate.SetBool("Moving", true);
 
             //rotate to look at the player 
             myTransform.rotation = Quaternion.Slerp(myTransform.rotation, Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed * Time.deltaTime);
 
             //move towards the player
             myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
 
             rb.isKinematic = false;
 
         }
         else
         {
             rb.isKinematic = true;
             agent.enabled = true;
             agent.destination = finalPosition;
             //PathRemaining();
         }
     }
 
     void RandomPosition()
     {
         Vector3 randomDirection = Random.insideUnitSphere * 10.0f;
 
         randomDirection += transform.position;
         finalPosition = randomDirection;
     }
 
     void OnTriggerEnter(Collider col)
     {
         if (col.gameObject.tag == "Slime")
         {
             animate.SetBool("Moving", false);
             GetComponent<SwarmBehaviour>().enabled = false;
         }
     }
 
     void OnTriggerExit(Collider col)
     {
         if (col.gameObject.tag == "Slime")
         {
             GetComponent<SwarmBehaviour>().enabled = true;
         }
     }
 
 }