Upload repeating problem

When uploading a 105MB file smartFTP always gets all the way through the file and as soon as it reaches 100% it starts again from 0%!
Has anybody else had this problem? One thing I've thought may be the problem is that I don't have access to enough space on the site to upload this file but this shouldn't be the case and if it was surely smartFTP would show an error message or something like that? The log window does not display any message at all when this happens.
Can anyone shed any light on this matter, and what should normally happen (e.g. error message) if you try to upload a file which is too big for the space you have online?
Many thanks,