Only part of file being copied, no errors in log

welcome to the forum,

maybe you upgraded rclone and then the issue started?

need to figure out if this is a rclone issue or not, do some basic testing

  1. do chkdsk on the source and dest
  2. copy the files without using rclone
  3. copy the files using rclone, without using rclone smb remote. use native tools to access the share
    check out my howto guide about smb

does nothing when used on smb remotes