Which build of FlashFXP are you using ? (Please dont just say latest).
Is it any particular FTP server this is happening on ? or on different ones ?
Is it a straight download ? or upon resume ?
When you say there are more than one instance, do you mean more than one instance trying to download the same files ? from the same or different sites ?
As you can imagine we need all the info we can get... your at the computer, not us.
Also, are you using an offical version downloaded from
www.flashfxp.com ?