Freezing move with joystick

Hello, im new in andoid and i try to create some basic runner game, I have basic joystick for control moving and button for jump, problem is when i force player in to the wall and then turn to oposite side my control freez, player slowly move and i cant stop it, i must restart game to fix it. It happend sometimes in different situation.
(all controls just freez and cant do anything).

This is my script for control joystick:

Code (CSharp):

1. private Image bgImg;
2.     private Image joystickImg;
3.  
4.     public Vector3 InputDirection { set; get; }
5.  
6.     private void Start()
7.     {
8.         bgImg = GetComponent<Image>();
9.         joystickImg = transform.GetChild(0).GetComponent<Image>();
10.         InputDirection = Vector3.zero;
11.     }
12.  
13.     public virtual void OnDrag (PointerEventData ped)
14.     {
15.         Vector2 pos = Vector2.zero;
16.         if (RectTransformUtility.ScreenPointToLocalPointInRectangle
17.             (bgImg.rectTransform, ped.position, ped.pressEventCamera, out pos))
18.         {
19.             pos.x = (pos.x / bgImg.rectTransform.sizeDelta.x);
20.  
21.             float x = (bgImg.rectTransform.pivot.x == 1) ? pos.x * 2 + 1 : pos.x * 2 - 1;
22.  
23.             InputDirection = new Vector3(x, 0, 0);
24.             InputDirection = (InputDirection.magnitude > 1) ? InputDirection.normalized : InputDirection;
25.  
26.             joystickImg.rectTransform.anchoredPosition =
27.                 new Vector3(InputDirection.x * (bgImg.rectTransform.sizeDelta.x / 3), 0);
28.         }
29.     }
30.  
31.     public virtual void OnPointerDown(PointerEventData ped)
32.     {
33.         OnDrag (ped);
34.     }
35.  
36.     public virtual void OnPointerUp(PointerEventData ped)
37.     {
38.         InputDirection = Vector3.zero;
39.         joystickImg.rectTransform.anchoredPosition = Vector3.zero;
40.     }

And this is script for player:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5.  
6. public class PlayerControl : MonoBehaviour {
7.  
8.     float speed;
9.     public int manaNum;
10.     public int maxMana;
11.     public float accelerate;
12.     public float jumpForce;
13.     public bool grounded;
14.     Rigidbody2D rb;
15.     public VirtualJoystick moveJoystick;
16.     GameObject mana;
17.  
18.     private Touch touch;
19.  
20.     void Start () {
21.         rb = GetComponent<Rigidbody2D>();
22.         mana = GameObject.Find("ManaText");
23.         manaNum = maxMana;
24.        
25.     }
26.  
27.     void Update()
28.     {
29.         Mana();
30.  
31.         if (grounded)
32.             if (moveJoystick.InputDirection != Vector3.zero)
33.             {
34.                 speed = moveJoystick.InputDirection.x;
35.             }
36.             else
37.             {
38.                 speed = 0;
39.             }
40.  
41.         rb.velocity = new Vector2(speed * accelerate, rb.velocity.y);
42.         Debug.Log(speed);
43.  
44.         if (speed >= 0)
45.         {
46.             transform.rotation = Quaternion.Euler(new Vector3(0, 0, 0));
47.         }
48.         else
49.         {
50.             transform.rotation = Quaternion.Euler(new Vector3(0, 180, 0));
51.         }
52.     }
53.  
54.     public void Jump()
55.     {
56.         if (grounded)
57.             rb.velocity = new Vector2(0, jumpForce);
58.     }
59.  
60.     void OnCollisionEnter2D(Collision2D collision)
61.     {
62.         if (collision.gameObject.tag == "Ground")
63.         {
64.             grounded = true;
65.         }
66.  
67.         if (collision.gameObject.tag == "Star")
68.         {
69.             if (manaNum < maxMana)
70.             {
71.                 manaNum += 1;
72.                 Destroy(collision.gameObject);
73.             }
74.         }
75.     }
76.  
77.     void OnCollisionExit2D(Collision2D collision)
78.     {
79.         if (collision.gameObject.tag == "Ground")
80.         {
81.             grounded = false;
82.         }
83.     }
84.    
85.     void Mana()
86.     {
87.         mana.GetComponent<Text>().text = "MANA: " + manaNum.ToString();
88.         float relativeManaBar = (float)manaNum / (float)maxMana;
89.         GameObject.Find("ManaBar").transform.localScale = new Vector3(relativeManaBar, transform.localScale.y, transform.localScale.z);
90.     }

When i try to use Debug.Log() for speed information, then i can see, when it freez then speed is not 0 but 0.12...
I think it look like problem come from:
if (moveJoystick.InputDirection != Vector3.zero)
{
speed = moveJoystick.InputDirection.x;
}
But i dont know if i have true and what to do with it.

Thx for help.

 

Ok I find where is problem, i just changed:

Code (CSharp):

1. void OnCollisionEnter2D(Collision2D collision)
2.     {
3.         if (collision.gameObject.tag == "Ground")
4.         {
5.             grounded = true;
6.         }
7.         if (collision.gameObject.tag == "Star")
8.         {
9.             if (manaNum < maxMana)
10.             {
11.                 manaNum += 1;
12.                 Destroy(collision.gameObject);
13.             }
14.         }
15.     }
16.     void OnCollisionExit2D(Collision2D collision)
17.     {
18.         if (collision.gameObject.tag == "Ground")
19.         {
20.             grounded = false;
21.         }
22.     }

for this:

Code (CSharp):

1. void OnCollisionStay2D(Collision2D collision)
2.     {
3.         if (collision.gameObject.tag == "Ground")
4.         {
5.             grounded = true;
6.         }
7.     }
8.     void OnTriggerEnter2D(Collider2D collision)
9.     {
10.         if (collision.gameObject.tag == "Star")
11.         {
12.             if (manaNum < maxMana)
13.             {
14.                 manaNum += 1;
15.                 Destroy(collision.gameObject);
16.             }
17.         }
18.     }
19.     void OnCollisionExit2D(Collision2D collision)
20.     {
21.         if (collision.gameObject.tag == "Ground")
22.         {
23.             grounded = false;
24.         }
25.     }