PS, Feature Suggestion: add more flexability to "Delay between the downloads." So instead of only seconds, make milliseconds an option also... so you can say retry every 0.1 seconds or even 0.01 seconds.. WebZip has this feature and it seems to help keep a really good speed, and yet doesn`t completley hammer the server instantly as 0 wait time.. thus keeping the connection alive better; and improved speed.... And I really don`t want to use WebZip.
In most cases it may be caused by your personal firewall. Can you try to stop it and see if the behavior improves?
I will plan to add delays less than 1 second. Thank you!