Android Prefab Instantiate Doesn't Work

Hello everyone,
I try to make a simple 2D endless runner game. My game has a box spawner script which is not working on android device. This script stopped working on an android device but why I didn't understand.
This is my script and I uploaded the video sample how is working on an android device.

Code (CSharp):

1.  
2. public class BoxSpawner : MonoBehaviour
3. {
4.     public GameObject[] Box;
5.     public GameObject firstZone;
6.     public GameObject secondZone;
7.  
8.     public float Speed = 5f;
9.  
10.     float spawnZ = 10.0f;
11.  
12.     void Update()
13.     {
14.         MovePlatform();
15.     }
16.  
17.     public void CreateRandomCubes()
18.     {
19.         secondZone = firstZone;
20.         int a = Random.Range(0, 4);
21.         firstZone = Instantiate(Box[a], new Vector3(16, -6f, 0), transform.rotation) as GameObject;
22.  
23.         Debug.Log("Transform rotation " + transform.rotation);
24.     }
25.  
26.     public void MovePlatform()
27.     {
28.         firstZone.transform.Translate(Vector3.left * Speed * Time.deltaTime, Space.World);
29.  
30.         secondZone.transform.Translate(Vector3.left * Speed * Time.deltaTime, Space.World);
31.  
32.         if (firstZone.transform.position.x <= 0)
33.         {
34.             DestroyZone();
35.         }
36.     }
37.     public void DestroyZone()
38.     {
39.         Destroy(secondZone);
40.         CreateRandomCubes();
41.  
42.     }
43. }

 

Up.
I didn't find any solution