Cardboard app crashes when loading a new scene

Hello!

My cardboard app (build) crashes all the time when I try to load a new scene after completing level one. There's a sign in my scene and when I click on the sign it should load a new scene. This works perfectly on my PC but crashes on my mobile. The camera freezes after clicking on the sign, nothing happens and then i get a message "app stopped working". The "level 2" scene is lighter than the first one and the app size is 75MB. What might be the reason for crashing/freezing? The code for loading a new scene is:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEngine.SceneManagement;
4.  
5. public class SignPost : MonoBehaviour
6. {
7.  
8.     public void NewScene()
9.     {
10.  
11.  
12.         //Load new scene
13.         SceneManager.LoadScene("01underwater");
14.         Debug.Log("New scene loaded!");
15.  
16.  
17.     }
18. }

 

I made another build and tried the app again (I changed the second level to an empty unity scene) and it didn't crash. What's the best way to script the time interval between levels? It seems that my second level is quite heavy.

 

The terrain in the second scene is the reason for crashing/freezing. I replaced terrain with a plane and the problem disappeared and the second scene loaded immediately. Why is terrain causing crashing? I optimized it for mobileVR, I increased the draw pixel value to 100 and the base map distance is 8. Heightmap resolution is also low.