Raycast groundcheck not working when standing on Edges?

I am using Raycast to do a ground check, It does work however there's one issue!

Whenever the character is standing at the edge of the ground, it sometimes set grounded to false meaning we can't jump.. Any solution?

Here's the full code:

 using System.Collections;
 
 using System.Collections.Generic;
 
 using System.Collections.Specialized;
 
 using System.Security.Cryptography;
 
 using System.Threading;
 
 using UnityEngine;
 
 public class PlayerMovement : MonoBehaviour
 {
    [SerializeField] public LayerMask GroundMask;
    
     public CharacterController controller;
    
 
     public Transform cam;
 
     private bool groundedPlayer;
 
 
      public float distToGround  = 1f;
 
 
 
     public float speed = 6;
 
     public float gravity = -9.81f;
 
     public float jumpHeight = 3;
 
     Vector3 velocity;
 
 
   
 
 
     float turnSmoothVelocity;
 
     public float turnSmoothTime = 0.1f;
 
   float _slopeAngle;
 
     // Update is called once per frame
     
 
     void FixedUpdate()
 
     {
 
  
         GroundCheck();
         
 
       if (Input.GetButtonDown("Jump")){
           if (isGrounded){
               velocity.y = Mathf.Sqrt(jumpHeight * -2 * gravity);
           }
       }
 
         //gravity
 
         velocity.y += gravity * Time.deltaTime;
 
         controller.Move(velocity * Time.deltaTime);
 
         //walk
 
         float horizontal = Input.GetAxisRaw("Horizontal");
 
         float vertical = Input.GetAxisRaw("Vertical");
 
         Vector3 direction = new Vector3(horizontal, 0f, vertical).normalized;
 
 
 
 
 
         if(direction.magnitude >= 0.1f)
 
         {
 
             float targetAngle = Mathf.Atan2(direction.x, direction.z) * Mathf.Rad2Deg + cam.eulerAngles.y;
 
             float angle = Mathf.SmoothDampAngle(transform.eulerAngles.y, targetAngle, ref turnSmoothVelocity, turnSmoothTime);
 
             transform.rotation = Quaternion.Euler(0f, angle, 0f);
 
 
 
             Vector3 moveDir = Quaternion.Euler(0f, targetAngle, 0f) * Vector3.forward;
 
             controller.Move(moveDir.normalized * speed * Time.deltaTime);
 
         }
 
     }
 
 
 
 
 
 public bool isGrounded = false;
 
 void GroundCheck () {
 
         RaycastHit hit;
         if (Physics.Raycast(transform.position, Vector3.down, out hit, distToGround + 1.1f, GroundMask)) {
           _slopeAngle = (Vector3.Angle(hit.normal, transform.forward) - 90);
 
             isGrounded = true;
         } else {
             
             isGrounded = false;
         }
 
 
     }
 
 }