I'm using hosted service (IHostedService) to keep the connection always open in order to avoid connection overhead.
(e.g. call FtpClient.Connect at StartAsync method only and FtpClient.Disconnect at StopAsync)
And the FTP operations are done in the same connection during the application lifetime.

Is there any event fired if the FTP server disconnects or gets down? So, I could try to reconnect periodically to get the connection back alive.