ads working but stop after reloading scene

hey, I got this problem before but I got it fixed by just calling RemoveListener before reload the scene.
This time its not working I don't know if there's anything wrong in my code

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.Advertisements;
5.  
6. public class AdManager : MonoBehaviour, IUnityAdsListener
7. {
8.     public GameObject UndoMove;
9.     public GameObject Player;
10.  
11.     private GameObject[] MovingPlatformsArray;
12.     private Vector2[] MovingPlatformsPositonArray;
13.  
14.     [HideInInspector]public bool AdReady;
15.  
16.     public static AdManager instance;
17.  
18.     private string GooglePlay_ID = "ididid";
19.     string rewardedId = "rewardedVideo";
20.     private bool testMode = true;
21.  
22.     private void Start()
23.     {
24.         if (instance == null)
25.         {
26.             instance = this;
27.         }
28.         else {
29.             Destroy(this);
30.         }
31.        
32.        
33.         Advertisement.AddListener(this);
34.         Advertisement.Initialize(GooglePlay_ID, testMode);
35.        
36.     }
37.  
38.     public void ShowRewardedAd()
39.     {
40.         if (Advertisement.IsReady(rewardedId))
41.         {
42.             Advertisement.Show(rewardedId);
43.         }
44.  
45.     }
46.    
47.     public void OnUnityAdsDidError(string message)
48.     {
49.        
50.     }
51.  
52.     public void OnUnityAdsDidFinish(string placementId, ShowResult showResult)
53.     {
54.         if (showResult == ShowResult.Finished)
55.         {
56.            
57.             if (PlayerMovement.LastConnectedBody.gameObject.tag=="PlatformMove")
58.             {
59.                 MovingPlatformsArray = Player.GetComponent<PlayerMovement>().MovingPlatformsArray;
60.                 MovingPlatformsPositonArray = Player.GetComponent<PlayerMovement>().MovingPlatformsPositonArray;
61.                 int i = 0;
62.                 foreach (GameObject MovingPlatform in MovingPlatformsArray)
63.                 {
64.                     MovingPlatform.transform.position = MovingPlatformsPositonArray[i];
65.                     i++;
66.                 }
67.                 Player.GetComponent<PlayerMovement>().hj.autoConfigureConnectedAnchor = false;
68.             }
69.             Player.transform.position = PlayerMovement.LastMovePosition;
70.             Player.GetComponent<PlayerMovement>().hj.connectedBody = PlayerMovement.LastConnectedBody;
71.             Player.GetComponent<PlayerMovement>().hj.connectedAnchor = PlayerMovement.LastConnectedAnchor;
72.             PlayerMovement.FirstMove = false;
73.         }
74.         else if (showResult == ShowResult.Skipped)
75.         {
76.  
77.         }
78.         else if (showResult == ShowResult.Failed)
79.         {
80.  
81.         }
82.     }
83.  
84.     public void OnUnityAdsDidStart(string placementId)
85.     {
86.         if (PlayerMovement.LastConnectedBody.gameObject.tag == "PlatformMove")
87.         {
88.             Player.GetComponent<PlayerMovement>().hj.autoConfigureConnectedAnchor = false;
89.         }
90.         else
91.         {
92.             Player.GetComponent<PlayerMovement>().hj.autoConfigureConnectedAnchor = true;
93.         }
94.     }
95.  
96.     public void OnUnityAdsReady(string placementId)
97.     {
98.  
99.         if (placementId == rewardedId)
100.         {
101.             AdReady = true;
102.         }
103.         else
104.         {
105.             AdReady = false;
106.         }
107.     }
108.  
109.     public void DestroyInstance()
110.     {
111.         Advertisement.RemoveListener(this);
112.        
113.     }
114.  
115.  
116.     private void Update()
117.     {
118.         if (PlayerMovement.FirstMove == true && AdReady == true)
119.         {
120.             UndoMove.SetActive(true);
121.         }
122.         else
123.         {
124.             UndoMove.SetActive(false);
125.         }
126.     }
127.  
128.  
129. }
130.  

and here is when I reload my scene

Code (CSharp):

1. public void Restart()
2.     {
3.         AdManager.instance.DestroyInstance();
4.         SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
5.     }

I checked if my function wasn't getting called with a print but it seems to be working fine.
Tried switching to unity monetization from the asset store but same problem occurs
any help please?

 

I am having the same issue, how do i add this instance = null; and where. i am a newbie to this
my own is rewarded ads
This code keeps destroying my ads when the scene is reloaded

_showAdButton.onClick.RemoveAllListeners();
how do I get it not to destroy when a new scene reloads?
This is for a rewarded ad the ad works fine on the first scene.