纹理在opengl中消失

我看到这个问题，在应用程序使用一两分钟后，纹理就会消失。为什么纹理会消失？3d立方体始终保持在屏幕上。纹理消失时，纹理所在的位置显示为白框。

我的DrawGLScene方法如下：

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
            glLoadIdentity();   // Reset The Current Modelview Matrix
            glTranslatef(0.0f, 0.0f, -7.0f);    // Translate Into The Screen 7.0 Units
//rotquad is a value that is updated as the user interacts with the ui by +/-9 to rotate the cube
        glRotatef(rotquad, 0.0f, 1.0f, 0.0f);
        //cube code here
            RECT desktop;
            const HWND hDesktop = GetDesktopWindow();
            GetWindowRect(hDesktop, &desktop);
            long horizontal = desktop.right;
            long vertical = desktop.bottom;
            glMatrixMode(GL_PROJECTION);
            glPushMatrix();
            glLoadIdentity();
            glOrtho(-5.0, 3, 3, -5.0, -1.0, 10.0);
            glMatrixMode(GL_MODELVIEW);
            glLoadIdentity();
            glDisable(GL_CULL_FACE);
            glEnable(GL_TEXTURE_2D);
            glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
            glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
            glClear(GL_DEPTH_BUFFER_BIT);
            glColor4f(255.0f, 255.0f, 255.0f, 0.0f);
            if (hoverRight) {
                imageLoaderOut(outImage);
                imageLoaderIn(inImage);
                imageLoaderUp(upImage);
                imageLoaderLeft(leftHover);
                imageLoaderDown(upImage);
                imageLoaderRight(rightImage);
            }
    // code for hover left, up and down are the same as hover right code above 
        glDisable(GL_TEXTURE_2D);
        return TRUE;    // Keep Going
    }

该方法是imageLoad方法之一（其他被调用的方法几乎相同，除了位置。

        void imageLoaderOut(const char* value)
        {
            FIBITMAP* bitmap60 = FreeImage_Load(
                FreeImage_GetFileType(value, 0),
                value, PNG_DEFAULT);
            FIBITMAP *pImage60 = FreeImage_ConvertTo32Bits(bitmap60);
            int nWidth60 = FreeImage_GetWidth(pImage60);
            int nHeight60 = FreeImage_GetHeight(pImage60);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, nWidth60, nHeight60, 0, GL_RGBA, GL_UNSIGNED_BYTE, (void*)FreeImage_GetBits(pImage60));
            FreeImage_Unload(pImage60);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
            glBegin(GL_QUADS);
            glTexCoord2f(0.0f, 0.0f); glVertex2f(2.8f, -1.1f); // moves BOTTOM EDGE UP or DOWN - stretches length of image
            glTexCoord2f(0.0f, 1.0f); glVertex2f(2.8f, -1.9f);
            glTexCoord2f(1.0f, 1.0f); glVertex2f(2.1f, -1.9f);
            glTexCoord2f(1.0f, 0.0f); glVertex2f(2.1f, -1.1f); // moves BOTTOM EDGE UP or DOWN - stretches length of image
            glEnd();
        }