Hi everyone, I am trying to make a simulation and I need to spawn in capsules (navagents) which will wander randomly trying to collect food on a plane

using NUnit.Framework.Interfaces;
using Unity.AI.Navigation;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.AI;

public class randomMove : MonoBehaviour
{
    private float timer;
    public float newtarget;
    public float speed;
    private NavMeshAgent agent;
    private Vector3 target;
    private Object plane;
    private float x_bound, z_bound;
    private float energy = 30.0f;
    private int numFood = 0;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        agent = gameObject.GetComponent<NavMeshAgent>();
        plane = agent.navMeshOwner;
        x_bound = plane.GetComponent<MeshCollider>().bounds.size.x;
        z_bound = plane.GetComponent<MeshCollider>().bounds.size.z;
        x_bound /= 2;
        z_bound /= 2;
        //search for food
        //moves once every newtarget seconds
        timer += Time.deltaTime;
        if(timer >= newtarget)
        {
            newTarget();
            timer = 0;
        }
        //loses energy
        energy -= Time.deltaTime;
    }

    // Update is called once per frame
    void Update()
    {
        if(energy<=0)
        {
            this.gameObject.SetActive(false);
        }
        if(numFood <= 0)
        {
            //search for food
            //moves once every newtarget seconds
            timer += Time.deltaTime;
            if(timer >= newtarget)
            {
                newTarget();
                timer = 0;
            }
            //loses energy
            energy -= Time.deltaTime;
        }
        if(numFood > 0)
        {
            if(checkBounds())
            {
                agent.ResetPath();
                agent.velocity = Vector3.zero;
                agent.isStopped = true;
            }
            else
            {
                //moves once every newtarget seconds
                timer += Time.deltaTime;
                if(timer >= newtarget)
                {
                    newTarget();
                    timer = 0;
                }
                //loses energy
                energy -= Time.deltaTime;
            }
        }
    }

    void newTarget()
    {

        float newX = Random.Range(-x_bound, x_bound);
        float newZ = Random.Range(-z_bound, z_bound);

        target = new Vector3(newX, gameObject.transform.position.y, newZ);
        agent.SetDestination(target);
    }

    void OnTriggerEnter(Collider other)
    {
        if(other.CompareTag("food"))
        {
            numFood++;
            other.gameObject.SetActive(false);
        }
    }

    bool checkBounds()
    {
        var xPos = agent.transform.position.x;
        var zPos = agent.transform.position.z;
        return xPos == x_bound || xPos == -x_bound || zPos == z_bound || zPos == -z_bound;
    }
}

its a bit lengthy but essentially I want the capsules to stop at the edge of the plane (or at the boundary) if they have collected 1 or more food but no matter how I try I just cant get it to work, the capsules do stop if they are at the edge but immediately move off again and idk what is wrong with my code

Help is very much appreciated

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