Hello,
Welcome to Microsoft Community and appreciate your time taken for sharing detailed information.
5,000 is the maximum number of responses **** you could download to a single Excel workbook. So you were able to get four Excel files correctly before, but now you couldn't. Our suggestion is that you first check whether the url in your Form is set to the appropriate DownloadFileSize. If it is convenient, could you take a screenshot and show us what the url of your exported form looks like so that we could better understand your problem?
Feel free to post back if you need any further assistance.
Best Regard,
Kevin | Microsoft Community Support Specialist
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