Combining State Machine with Pathfinding

Hi, I have a wandering chicken, but I can't seem to stop her randomly moving while in idle, and then also walking on the spot.

Can anyone see the issue with my code?

 using UnityEngine;
 using System.Collections;
 
 public class ChickenAi : MonoBehaviour {
 
     public Transform[] wayPoints;
 
     NavMeshAgent navMesh;
     int randomNumber;
     public int behaviour;
     public Transform currentWaypoint;
     Animator anim;
 
     // Use this for initialization
     void Start () {
         
         navMesh=GetComponent<NavMeshAgent>();
         anim=GetComponent<Animator>();
         StartCoroutine(AnimalBehaviour());
     
     }
 
     IEnumerator AnimalBehaviour(){
         
             while (true) {
                 
                 //Choose a behaviour
                 behaviour = Random.Range (0, 4);
 
             if (behaviour == 0) {
 
                 //Choose a random waypoint
                 randomNumber=Random.Range(0,wayPoints.Length);
                 currentWaypoint=wayPoints[randomNumber];
 
                 //go to selected waypoint
                 navMesh.SetDestination (currentWaypoint.position);
 
                 //Apply animation
                 anim.SetTrigger("Walk");
         
             }
             else if (behaviour == 1) {
                 
                 anim.SetTrigger("Idle1");
 
                 //stop Movement
                 navMesh.ResetPath();
 
             } 
             else if (behaviour == 2) {
                 
                 anim.SetTrigger("Idle2");
 
                 //stop Movement
                 navMesh.ResetPath();
             } 
             else if (behaviour == 3) {
 
                 anim.SetTrigger("Eat");
 
                 Debug.Log ("Eating");
                 //stop Movement
                 navMesh.ResetPath();
             }
             yield return new WaitForSeconds(Random.Range(5.0f,6.0f));
 
         }
     }
 }

I've tried using NavMesh.Stop() and navMesh.Resume() but still getting the mismatched behaviours.

Thanks