Windows Phone的Unity应用程序崩溃

我在Unity for Windows Phone中编写了非常简单的应用程序。

水族馆背景、气泡（粒子系统）和鱼类从左到右、从右到左移动。

我将应用程序免费发布到Windows Phone应用商店，报告中有许多崩溃。

我可以导出的堆栈跟踪：

App: AquariumInPhone
OS version: 8.0
Problem function: Unknown
Exception type: c0000005
30-day crash count: 23
Stack trace:
Frame    Image          Function                             Offset        
0        ntdll          RtlpWaitOnCriticalSection            0x0000007e    
1        ntdll          RtlpEnterCriticalSectionContended    0x00000060    
2        unityplayer                                         0x002ef5ac

这是一个非常简单的应用程序，但会崩溃：（

向左移动的鱼有代码：

using UnityEngine;
public class Fish1 : MonoBehaviour {
    float speed = 0.0032f;
    Vector3 startPoint;
    Vector3 currentPosition;
    System.Random r = new System.Random ();
    void Start()
    {    
        startPoint = transform.position;
        currentPosition = transform.position;
    }
    void Update ()
    {
        if (Camera.main.WorldToViewportPoint(transform.position).x < -0.2f)
        {
            int newY = r.Next(0, 5);
            if(r.Next(0, 2) == 0)
                newY = -newY;
            Vector3 pos = new Vector3(12.0f, (float)newY, 0.0f);
            currentPosition = pos;
            transform.position = currentPosition;
        }
        else
        {
            currentPosition.x--;
            transform.position += (currentPosition + startPoint) * speed * Time.deltaTime;
        }
    }
}

向右移动的鱼有代码：

using UnityEngine;
public class Fish2 : MonoBehaviour {
float speed = 0.005f;
Vector3 startPoint;
Vector3 currentPosition;
System.Random r = new System.Random ();
void Start()
{    
    startPoint = transform.position;
    currentPosition = transform.position;
}
void Update ()
{
    if (Camera.main.WorldToViewportPoint(transform.position).x > 1.2f)
    {
        int newY = r.Next(0, 5);
        if(r.Next(0, 2) == 0)
            newY = -newY;
        Vector3 pos = new Vector3(-12.0f, (float)newY, 0.0f);
        currentPosition = pos;
        transform.position = currentPosition;
    }
    else
    {
        currentPosition.x++;
        transform.position += (currentPosition + startPoint) * speed * Time.deltaTime;
    }
}
}

崩溃的原因是什么？我该怎么解决这个问题？

Greets，David