It may be easier to continue this via email. You can follow up with me at email@example.com.
In terms of the debug log, you can go to wbond.net/sublime_packages/sftp/support for instructions on how to turn it on, but most likely if the dots continued an exception was raised that was not caught. This will be printed in the console (ctrl+`). If you can replicate what happened, I'd like to get the bug fixed. These idle timeouts have been quite a bear to handle since it seems every unique combination of FTP or SFTP server brand, plus router and OS creates different types of errors. I've squashed quite a number of them, but it seems there are still some more.