ui panel disappears after showing for few seconds ?(problem)

i have a endless game , balls spawn endlessly and when wrong collision happens it shows a game over panel , the panel shows just fine but it doesnt last , it only shows for like 1 or 2 seconds then disappears

Environment : ball script which is attached to the ball prefab

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.SceneManagement; using UnityEngine.UI; using GoogleMobileAds.Api;

public class ball : MonoBehaviour { public static ball instance; public string currentcolor; public SpriteRenderer sr; public int targetscore = 10; public Color colorred; public Color coloryellow; public Color colorblue; public AudioSource collsound; float speed = 7; public GameOver_s gameOver; public float score; public GameManager CurrentScore; //-------------- public GameObject Panel; //----------- public GameObject BallSpawner ; // private bool isDead = false; private float StartTime;

 //----------------
  

 // Start is called before the first frame update
 void Start()
 {
     hidePanel();
     collsound = GetComponent<AudioSource>();
    
     SetRandomColor();
     
 }
 void Update()
 {
     transform.Translate(Vector3.down * speed * Time.deltaTime);
 }
 void OnTriggerEnter2D(Collider2D col)
 {

     if (col.tag == "ball")
     {
         gameObject.GetComponent<AudioSource>().Play();
         
         Debug.Log(currentcolor);
     }
     if (col.tag == "colorchanger")
     {

         SetRandomColor();
         return;
     }

      if (col.tag != currentcolor)
     {
   
         Destroy(GameObject.Find("circle"));
         Destroy(GameObject.Find("circle (1)"));
         Destroy(GameObject.Find("circle (2)"));
         ShowPanel();
        
         return;
         
      }

     GameManager.singleton.AddScore(1);
    
 }

public void OnAdPanelExited () {

     SceneManager.LoadScene("GameOver");
     
 }

 void SetRandomColor()
 {
     int index = Random.Range(0, 3);
     switch (index)
     {

         case 0:
             currentcolor = "yellow";
             sr.color = coloryellow;
             break;
         case 1:
             currentcolor = "red";
             sr.color = colorred;
             break;
         case 2:
             currentcolor = "blue";
             sr.color = colorblue;
             break;
     }

 }
 public void ShowPanel()
 {
     AdPanelManager.instance.DisplayPanel(); 
 }
 public void hidePanel()
 {
     AdPanelManager.instance.HidePanel();
 }

} and here is the one attached to the panel : using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; public class AdPanelManager : MonoBehaviour {

 public GameObject Panel;
 public static AdPanelManager instance;

 private void Awake()
 {
     //Check if instance already exists
     if (instance == null)


         instance = this;

     else if (instance != this) 

       Destroy(gameObject);
      
     DontDestroyOnLoad(gameObject);
     
 }
 // Start is called before the first frame update
 void Start()
 {
     //Panel = GameObject.Find("ADPanel_Holder");
     HidePanel();
 }
 public void DisplayPanel()
 {
     Panel.SetActive(true);
     //DontDestroyOnLoad(gameObject);
 }
 public void HidePanel()
 {
     Panel.SetActive(false);
 }

}