Running two NSStreams in two different threads

Question

My app runs a network task in a separate thread - it gets data from my server, processes it and displays the results on an ongoing basis. This works fine when I have only one such network connection in one thread. However, if I run a second thread with a similar network task, the second one works fine, but the first one stops responding. The code for my class that schedules the network processes is as follows. Any thoughts on what might be going wrong here?

NSThread * nThread;

- (NSThread *)networkThread {
    nThread = nil;

        nThread =
        [[NSThread alloc] initWithTarget:self
                                selector:@selector(networkThreadMain:)
                                  object:nil];
        [nThread start];

    DLog(@"thread: %@, debug description: %@", nThread, nThread.debugDescription);
    return nThread;
}


- (void)networkThreadMain:(id)unused {
    do {
            [[NSRunLoop currentRunLoop] run];
    } while (YES);
}

- (void)scheduleInCurrentThread:(id)unused
{
    [inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
                           forMode:NSRunLoopCommonModes];
    [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
                           forMode:NSRunLoopCommonModes];
}

-(BOOL) connectWithError:(NSString **) e
{
    CFReadStreamRef readStream;
    CFWriteStreamRef writeStream;
    CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"127.0.0.1", [server port], &readStream, &writeStream);
    inputStream = (__bridge NSInputStream *) readStream;
    outputStream = (__bridge NSOutputStream *) writeStream;

    [inputStream setDelegate:self];
    [outputStream setDelegate:self];

    [self performSelector:@selector(scheduleInCurrentThread:)
                 onThread:[self networkThread]
               withObject:nil
            waitUntilDone:YES];

    [inputStream open];
    [outputStream open];
}