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HandleEventsForBackgroundURLSession is never called: ios7 Background Transfer Service

I spent 2 days and I think I need help. Of course, I tried to search on stackOverflow, but could not solve the problem.

My application uploads files (from 2 MB to 100 MB).

I use the background transfer service (ios7)

when the user clicks the button, I start the download as shown below (immediately he presses the "home" button):

NSURLSessionConfiguration * backgroundConfig = [NSURLSessionConfiguration backgroundSessionConfiguration:self.url];
self.session = [NSURLSession sessionWithConfiguration: backgroundConfig delegate:self delegateQueue: [NSOperationQueue mainQueue]];
self.downloadTask =[ self.session downloadTaskWithURL:url];
[self.downloadTask resume];

The delegate method works well for me:

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {

-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite

I also installed:

- (void)application:(UIApplication *)application handleEventsForBackgroundURLSession:(NSString *)identifier completionHandler:(void (^)())completionHandler {
    NSLog(@"<<<<<<<<<  Save completionHandler >>>>>>>>>>>>>>");

    self.backgroundSessionCompletionHandler = completionHandler;
}


-(void)URLSessionDidFinishEventsForBackgroundURLSession:(NSURLSession *)session
{
    NSLog(@"Background URL session %@ finished events.\n", session);

    AppDelegate * delegate =(AppDelegate *)[[UIApplication sharedApplication] delegate];
    if(delegate.backgroundSessionCompletionHandler)
    {
        void (^handler)() = delegate.backgroundSessionCompletionHandler;
        handler();
    }

}

in AppDelegate.h

I get the block property:

@property (copy) void (^backgroundSessionCompletionHandler)();

I actually followed this tut: http://code.tutsplus.com/tutorials/ios-7-sdk-background-transfer-service--mobile-20595

My problem is that sometimes I upload a file, and sometimes not. only part of the file is present in the file system.

handleEventsForBackgroundURLSession, !

- ?

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