Getting ServiceApiException on certain PDFs

Hello,

I'm getting the following error when running PDF text extraction on certain PDFs:

raise OperationException(message="Error response received for request",
adobe.pdfservices.operation.internal.exceptions.OperationException

adobe.pdfservices.operation.exception.exceptions.ServiceApiException: description =ERROR - Unable to extract content. Internal error; requestTrackingId=yQtpe6ZOBTtkGWg7b3hnHgjTqOVFuIaH; statusCode=500; errorCode=ERROR

The API is working for most PDFs, but also regularly failing about 5% of the time, for various PDFs.

An example of a PDF that fails to extract is here (also attached): https://openreview.net/pdf?id=xmJsuh8xlq

I'm not clear what is causing the issue. Is it math symbols? Images? Tables? Something else entirely?

Any light you could shed would be very helpful. Thank you!