Bulk Export Fails Silently for Batches of 12+ Transcripts

I want to be able to reliably export large batches of transcripts (e.g., 12 or more) without silent failures. Currently, when selecting 12 files, only a subset (e.g., 7) exports successfully, and the rest fail without an error message. Exporting in smaller batches (5-6) works, but is inconvenient. This is likely due to an undocumented limit or timeout in the bulk export process.