@Matthew Tribby​ can you try following:

Copy the problematic files to a separate bucket and just transfer those files. See if the error persists.

If it does, then probably the files have some issues.

The issue could be around file size as the docs states that `This works for small files, but quickly becomes an issue as file size increases.` Is it possible for you to split up the files or maybe try to increase resources on the cluster.

On a side note: Why can't you use `aws s3 sync s3://mybucket s3://mybucket2` ?