Scripts containing RETL calls, sometimes don't terminate

Hello,

We are facing a strange issue. Sometimes, scripts that contain RETL calls keep executing forever, and don't terminate. This has happened in different environments. The flows being executed are always exports from AIP-Online database (namely schedules). When we check the output files, all the expected information is there, but the script doesn't end. If we kill the RETL process, and restart the script, everything works right, and the script terminates with success.

It's just strange, as we can't identify a pattern, nor a set of conditions, and therefore can't reproduce the issue when wanted. So it's difficult to fill a SR. The machine has enough memory and CPU, so that is not an issue.