That sounds to me like a physical issue rather then a software issue, simply because you tried another ftp client try looking at things like cables, nic cards, ports, maybe even router itself or the way its configured
try also doing a ftp tranfer to another pc see if problem persists.
if you also allways found this problem to be true with your xbox it could even be an issue with te way you "customized" your xbox in order to have XBMC running... but then again this is not the place to discuss that.
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