we have problems with splitting large xml files (5000 invoices) in seperated xml files ( 1 xml file for each Invoice).

I did some tests by creating a simple watch process, which uses a xslt script to split the xml file. With an xml file up to +/- 2000 invoices, we have no problems.The watch process generates 2000 xml files.
With larger files the watch process is running for a long time, and in the output directory there is no single file.

I tried the same with the XML SPLIT action in PlanetPress Watch With the same result. With larger files there is no output.

Any ideas what can be the problem?