If you are using too many "Chunks per download," the server might kill the connection. Go to the bottom right of the JDownloader window. Lower Max Chunks per Download to 1 or 2 . Lower Max Simultaneous Downloads to 1 or 2 .
The error in JDownloader typically occurs when the software fails to download a specific part (segment) of a file, usually due to a breakdown in communication between the program and the host server . Common Causes jdownloader segment not loaded