Ios NSURLConnection post请求在一段时间后停止发布

我正在尝试将一些值发布到我的web服务中，该服务在android版本中运行良好，在iOS版本中，它可以处理大约12个请求，然后停止发送。我做错了什么

我每秒发送大约1个

-(void) PostDataToServer:(NSMutableArray*) value
{
    NSString *xValue = [NSString stringWithFormat:@"%@", [value objectAtIndex:0]];
    NSString *yValue = [NSString stringWithFormat:@"%@", [value objectAtIndex:1]];
    NSString *jsonRequest = [NSString stringWithFormat:@"{\"person\":\"%@\",\"x\":\"%@\",\"y\":\"%@\",\"z\":\"%@\"}",@"1",xValue ,yValue ,@"0.0"];
    NSLog(@"Request: %@", jsonRequest);

    NSURL *url = [NSURL URLWithString:@"mywebserviceURL"];

    request = [[NSMutableURLRequest alloc] initWithURL:url];
    NSData *requestData = [NSData dataWithBytes:[jsonRequest UTF8String] length:[jsonRequest length]];

    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody: requestData];
    NSData *urlData= connection= [NSURLConnection connectionWithRequest:request delegate:self];
    NSLog(urlData);

---

如何调用此方法？如[self-PostDataToServer:value]；你说你每秒发送1个。如何每秒发送1个？请编辑您的问题，以包括调用

[self PostDataToServer:value]

的整个方法。