IPhone app crashes due to low memory, but works fine in simulator

Honey, I have a navigation app with about 60 views.

I did the following: 1. Build and analyze: bulid successfully, no complaints. 2. Appliance distribution and leakage: no leakage.

However, the app crashed on iPhone or iPad, but works fine in the simulator. The crash occurs at about 50th place. There are no crash reports, but I can see LowMemory.log in the crashreporter folder.

I have updated my iphone and ipad to 4.2

Does anyone have any idea what might be wrong? I've been reading and troubleshooting for a week.

Thanks for all the answers.

My app has a root view called contentViewController and users can navigate to 4 polls from here.

This is the code I am using to return to the root view.

- (void)goHome {
UIAlertView *alert = [[UIAlertView alloc]
                      initWithTitle: @"Warning"
                      message: @"Proceed?"
                      delegate: self
                      cancelButtonTitle:@"Yes"
                      otherButtonTitles:@"No",nil];
[alert show];
[alert release];

      

        
        
        
      

    

}

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
[[self navigationController] setNavigationBarHidden:NO animated:YES];
if (buttonIndex == 0) {
    NSArray * subviews = [self.view subviews];
    [subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
    self.view = nil;
    if (self.contentViewController == nil)
    {
        ContentViewController *aViewController = [[ContentViewController alloc]
                                                  initWithNibName:@"ContentViewController" bundle:[NSBundle mainBundle]];
        self.contentViewController = aViewController;
        [aViewController release];
    }
    [self.navigationController pushViewController:self.contentViewController animated:YES]; 
}

      

        
        
        
      

    

}

Example code for displaying views:

-(IBAction) buttonArrowClicked:(id)sender {
NSURL *tapSound   = [[NSBundle mainBundle] URLForResource: @"click"
                                            withExtension: @"aif"];

// Store the URL as a CFURLRef instance
self.soundFileURLRef = (CFURLRef) [tapSound retain];

// Create a system sound object representing the sound file.
AudioServicesCreateSystemSoundID (

                                  soundFileURLRef,
                                  &soundFileObject
                                  );
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

if (![[defaults stringForKey:@"sound"] isEqualToString:@"NO"]) {
    AudioServicesPlaySystemSound (soundFileObject);
}       

if (self.exercise2ViewController == nil)
{
    Exercise2ViewController *aViewController = [[Exercise2ViewController alloc]
                                                initWithNibName:@"Exercise2ViewController" bundle:[NSBundle mainBundle]];
    self.exercise2ViewController = aViewController;
    [aViewController release];
}
[self.navigationController pushViewController:self.exercise2ViewController animated:YES];   

      

        
        
        
      

    

}