IEnumerator MoveRandomPos()
    {
        yield return new WaitForSeconds(Random.Range(4f, 7f));

        StartCoroutine(MoveRandomPos());

        RaycastHit hit;
        Ray ray = new Ray(transform.position, Quaternion.Euler(0f, Random.Range(0f, 360f), 0f) * transform.forward);

        /*Debug.DrawRay(transform.position, ray.direction, Color.red, 3f);*/

        if (Physics.Raycast(ray, out hit))
        {
            if (hit.distance > 2f)
            {
                nav.SetDestination(ray.direction);
            }
        }
    }