Why do well seeded movies stop mid-download or not start at all?

For example, now I am trying to download The Truman Show ... with 15 seeders and no leechers ... should be a quick, easy download.

However, it hasn't started for hours. Is there something *I* can do to kickstart it?

A few days ago, I started Frida (2002) ... it stalled at 99.7%, and hasn't moved for over 2 days (despite showing 4 seeders and no leechers).

Suggestions/ideas?

Thanks.