Enemy AI Script, Enemy AI randomly stopping

I got this enemy AI script from this youtube tutorial. For some reason my character keeps stopping in random spots, or try to go through an object like a cube and get caught. Any Idea what the problem could be. the logic seems to make sense.

https://www.youtube.com/watch?v=UjkSFoLxesw

using UnityEngine;

using UnityEngine.AI;

public class EnemyAiTutorial : MonoBehaviour

{

 public NavMeshAgent agent;



 public Transform player;



 public LayerMask whatIsGround, whatIsPlayer;



 public float health;



 //Patroling

 public Vector3 walkPoint;

 bool walkPointSet;

 public float walkPointRange;



 //Attacking

 public float timeBetweenAttacks;

 bool alreadyAttacked;

 public GameObject projectile;



 //States

 public float sightRange, attackRange;

 public bool playerInSightRange, playerInAttackRange;



 private void Awake()

 {

     player = GameObject.Find("PlayerObj").transform;

     agent = GetComponent<NavMeshAgent>();

 }



 private void Update()

 {

     //Check for sight and attack range

     playerInSightRange = Physics.CheckSphere(transform.position, sightRange, whatIsPlayer);

     playerInAttackRange = Physics.CheckSphere(transform.position, attackRange, whatIsPlayer);



     if (!playerInSightRange && !playerInAttackRange) Patroling();

     if (playerInSightRange && !playerInAttackRange) ChasePlayer();

     if (playerInAttackRange && playerInSightRange) AttackPlayer();

 }



 private void Patroling()

 {

     if (!walkPointSet) SearchWalkPoint();



     if (walkPointSet)

         agent.SetDestination(walkPoint);



     Vector3 distanceToWalkPoint = transform.position - walkPoint;



     //Walkpoint reached

     if (distanceToWalkPoint.magnitude < 1f)

         walkPointSet = false;

 }

 private void SearchWalkPoint()

 {

     //Calculate random point in range

     float randomZ = Random.Range(-walkPointRange, walkPointRange);

     float randomX = Random.Range(-walkPointRange, walkPointRange);



     walkPoint = new Vector3(transform.position.x + randomX, transform.position.y, transform.position.z + randomZ);



     if (Physics.Raycast(walkPoint, -transform.up, 2f, whatIsGround))

         walkPointSet = true;

 }



 private void ChasePlayer()

 {

     agent.SetDestination(player.position);

 }



 private void AttackPlayer()

 {

     //Make sure enemy doesn't move

     agent.SetDestination(transform.position);



     transform.LookAt(player);



     if (!alreadyAttacked)

     {

         ///Attack code here

         Rigidbody rb = Instantiate(projectile, transform.position, Quaternion.identity).GetComponent<Rigidbody>();

         rb.AddForce(transform.forward * 32f, ForceMode.Impulse);

         rb.AddForce(transform.up * 8f, ForceMode.Impulse);

         ///End of attack code



         alreadyAttacked = true;

         Invoke(nameof(ResetAttack), timeBetweenAttacks);

     }

 }

 private void ResetAttack()

 {

     alreadyAttacked = false;

 }



 public void TakeDamage(int damage)

 {

     health -= damage;



     if (health <= 0) Invoke(nameof(DestroyEnemy), 0.5f);

 }

 private void DestroyEnemy()

 {

     Destroy(gameObject);

 }



 private void OnDrawGizmosSelected()

 {

     Gizmos.color = Color.red;

     Gizmos.DrawWireSphere(transform.position, attackRange);

     Gizmos.color = Color.yellow;

     Gizmos.DrawWireSphere(transform.position, sightRange);

 }

} 29