The ftp session log you posted doesn't show anything close to what you're telling me. The control connection is never lost, disconnected, or even re-connected and that would be clearly shown in the session log. Data connections don't count towards the connection limit.
The FTP protocol consists of two connections.
1. The control channel which is always connected and it's used to send commands to the ftp server.
2. The data channel which is only used for data transfers (files or listings), a new data channel is established for each and every request, but only one data channel is open at any given time.
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