Hello,
To make sure I understand, you can set the number of lines to 2 and the import would stop at 2 and if it is set to 2000 the import would stop at 2000? If you get a 500 error at that point it is clear that there must be something with the restart of the next batch.
The patch would not be related to the import stopping after it starts the next batch because if you import and XLSX file it would happen instantly.
If you set error reporting to maximum and run the import, can you post a screenshot of the error you see?
Perhaps we can get some information from the browser if the server has no logging, you can check the document
Using developer tools to analyze problems Please post the Response from the URL that fails, we may get some more information from there.
Finally, please post a backup of your template and import file so I can check if I can reproduce the issue here as well.
Kind regards,
RolandD
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