Double Jump Problem

Hi,
I'm writing a code for my platformer game .I have an issue with double jump .When I jump after 3 jump I'm not able to jump anymore also when I collide with object in scene.
My code is:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class PlayerController : MonoBehaviour {
5.     public float moveSpeed;
6.     public float jumpHeight;
7.     private Rigidbody2D rigi;
8.     public Transform groundCheck;
9.     public float groundCheckRadius;
10.     public LayerMask whatIsGround;
11.     private bool grounded;
12.     private bool doubleJumped;
13.     // Use this for initialization
14.     private void Awake()
15.     {
16.         rigi = GetComponent<Rigidbody2D>();
17.     }
18.     void Start () {
19.    
20.     }
21.     void FixedUpdate () {
22.         grounded = Physics2D.OverlapCircle(groundCheck.position, groundCheckRadius,whatIsGround);
23.                     }
24.     // Update is called once per frame
25.     void Update () {
26.         if (grounded)
27.                         doubleJumped = false;
28.             if(Input.GetKeyDown (KeyCode.Space) && grounded)
29.             {
30.             //rigi.velocity = new Vector2(rigi.velocity.x, jumpHeight);
31.             Jump ();
32.         }
33.         if(Input.GetKeyDown (KeyCode.Space) && !doubleJumped && !grounded)
34.         {
35.             //rigi.velocity = new Vector2(rigi.velocity.x, jumpHeight);
36.             Jump();
37.  
38.             doubleJumped=true;
39.         }
40.         if(Input.GetKey (KeyCode.RightArrow))
41.         {
42.             rigi.velocity = new Vector2(moveSpeed, rigi.velocity.y);
43.         }
44.         if(Input.GetKey (KeyCode.LeftArrow))
45.         {
46.             rigi.velocity = new Vector2(-moveSpeed, rigi.velocity.y);
47.         }
48.     }
49.     public void Jump(){
50.         rigi.velocity = new Vector2(rigi.velocity.x, jumpHeight);
51.     }
52. }

Thanks

 

Is it ALWAYS after 3 jumps? Doesn't seem to be any issue with your code. All I can think of is that maybe your groundCheck.position isn't hitting your ground properly, so it's not setting doubleJumped back to false.

Trying doing a Debug.Log(doubleJumped); on your Update function - this will output the value of doubleJumped to the console window, and see if doubleJumped is being properly set back to false every time.