The files I send are sent intermittently, why is this happening?

If the files you sent are sometime sent and other times won't, there are number of options why is this happening:

1. Your internet may have filter or it may be blocked. If you work at an office, try and ask your computer supervisor about your internet service. Click for More information

2. You might experiencing local Internet disconnections, infrastructure problem and so on that are independent of JUMBOmail and require additional file submissions.