QTcpSocket disconnection problem

[erdi]

QFile file(filePath + "/" + fileName);
file.open(QIODevice::ReadOnly);
QByteArray byteArray;
 
while (numberOfPackages > 0){
		byteArray = file.read(1024);
		numberOfPackages--;			
 
		if(sock->state()!=QAbstractSocket::ConnectedState){
		    printf("Socket disconnected error\n");
		    return;
		}
 
		sock->write(byteArray);
 
 
		if (sock->bytesToWrite() > 0 && !sock->waitForBytesWritten(10000)){
			printf("Socket write error\n");
			printf("socket error: %d %s, socket state: %d\n", sock->error(), sock->errorString().toAscii().data(), 
 
sock->state());
			return;
		}
 
}

QFile file(filePath + "/" + fileName);
file.open(QIODevice::ReadOnly);
QByteArray byteArray;

while (numberOfPackages > 0){
		byteArray = file.read(1024);
		numberOfPackages--;			
		
		if(sock->state()!=QAbstractSocket::ConnectedState){
		    printf("Socket disconnected error\n");
		    return;
		}

		sock->write(byteArray);


		if (sock->bytesToWrite() > 0 && !sock->waitForBytesWritten(10000)){
			printf("Socket write error\n");
			printf("socket error: %d %s, socket state: %d\n", sock->error(), sock->errorString().toAscii().data(), 

sock->state());
			return;
		}
				
}

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As I said the second if statement is executed after sending about 50KB of data.