Thanks Lyla,
There is not a logs directory in the path on the TIC. It seems that as the system is inserting data into the target table on TIC it randomly fails and reports a data service error. The script will fail on different records in the file. So for example, the scheduled job died on record 866 overnight. I ran the script this morning on the server to test it and it loaded up to record 897. So it randomly fails, and it has been loading fine for the last four days. Very strange.