Try increasing Reconnect attempts (FTP > Advanced > top section). It may need to be increased to quite a high value if you have line problems
Bear in mind that unlike manual clients where you can watch what's happening and intervene if any problems, an automated process has to have a limit otherwise in an error condition (reconnect, but immediate drop: repeat...), it may go into an endless loop...
If still problems, create a Support Zip with debug-out and submit a support ticket (use Contact Support link in article) and attach the Zip
Do not post (links to) Support Zips on this open forum...
Bear in mind that unlike manual clients where you can watch what's happening and intervene if any problems, an automated process has to have a limit otherwise in an error condition (reconnect, but immediate drop: repeat...), it may go into an endless loop...
If still problems, create a Support Zip with debug-out and submit a support ticket (use Contact Support link in article) and attach the Zip
Do not post (links to) Support Zips on this open forum...