Gravity not working with character control script

Hello, I have a rigidbody applying gravity to my "Player" but if I walk off an edge the player will remain in mid air and will only fall to the ground if I'm moving the player in a direction?!? my script is c#

 public class REController : MonoBehaviour
 {
     public float speed = 0.01f;
    
     Animator anim;
     private string axisName;
     int runHash = Animator.StringToHash("Run");
     int turnHash = Animator.StringToHash("StandHalfTurnRight");
 
 
     // Use this for initialization
     void Start()
 
     {
         anim = GetComponent<Animator>();
 
     }
 
 
 
     // Update is called once per frame
     void Update()
     {
         
         //WALKING
         float move = Input.GetAxis("Vertical");
         if (Input.GetKey(KeyCode.W))
             anim.SetFloat("Walk", move);
         if (Input.GetKeyUp(KeyCode.W))
             anim.SetFloat("Walk", 0);
         transform.Rotate(new Vector3(0, Input.GetAxis("Horizontal"), 0));
         //TURNING
         if (Input.GetKey(KeyCode.A))
             anim.SetBool("turnleft", true);
         else
             anim.SetBool("turnleft", false);
 
         if (Input.GetKey(KeyCode.D))
             anim.SetBool("turnright", true);
         else
             anim.SetBool("turnright", false);
 
         //RUNNING
         if (Input.GetKey(KeyCode.LeftShift) && Input.GetKey(KeyCode.W))
             anim.SetBool("run", true);
         if (Input.GetKeyUp(KeyCode.LeftShift))
             anim.SetBool("run", false);
         if (Input.GetKeyUp(KeyCode.W))
             anim.SetBool("run", false);
         //RUNNING TURN
         transform.Rotate(new Vector3(0, Input.GetAxis("Horizontal"), 0));