Sometimes tweets are not made

[krumlr]

I am using curl to send tweets and sometimes they don't go through yet
I do not get an error message. The section of curl that should take
care of this is

/* Execute and get the http code to see if it was succesfull or not*/
                $result = curl_exec($this->ch);
                $resultArray = curl_getinfo($this->ch);

                if ($resultArray['http_code'] == 200) ;
                        return true;

any ideas why this is not working?

Thanks
Pete