In line 1955 you are doing a curl_init, but you do not close the connection. I think you should do a curl_close($ch); on line 1986. Also, if the connection fails it will stop the entire script. It might be interesting to implement a retry for a set number of times so that it does not stop the importing of the entire set in the middle of the thing. I adapted the routine for myself in order to do 10 retries.