I'm experiencing the same problem, when uploading files to the FTP server.
The server is a FileZilla server, running FTPS (Not SFTP), using explicit encryption and a self signed certificate.
The FileZilla FTP client can upload the about 600MB of files in 2 minutes and 20 seconds, but after 20 minutes the WinSCP client is still not done uploading.
During upload, the server is reporting multiple errors with the message: "Control channel closed with error from source 0. Reason: ECONNABORTED - Connection aborted". This message does not appear for every file, but it appears often enough to be noticed. When this problem occurs, the WinSCP client will recover from the error and try again, but this also adds a few seconds of delay, every time it happens.
The problem occurs when using the client directly or when using it through PowerShell or in a C# application.
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