Also the same guy that did the JMJ protest with the carpeted 500€ bills:

https://www.euronews.com/culture/2023/08/01/portuguese-street-artist-criticizes-pope-francis-visit-with-banknote-carpet

I would look into either a permissions issue (the daemon having no permissions to write in your target folder), or a faulty disk issue. I’ve had a similar issue in the past and the former was the cause.

Your description seems coherent with the torrent downloading normally until the memory buffer is full, and then failing when the data is attempted to be written to the disk.