Hi

you need to make it clearer what you mean - if you're saying you've downloaded a file and then it seems to vanish - then - unless there's something really sick with your computer the file can't disappear (I lose track of files all the time cos I keep moving them around sub directories and forget where I've put them

but - if you're saying sometimes when you search for a particular file you can find it but then when you search at a different time you can't find it - well - thats just part of the pleasure and pain of the way the net works - one day that person in latvia has the file you're looking for is connected and the next day they're not (but maybe someone in germany who also has the file will be and so you'll get lucky)

with patience you'll find you can get pretty much whatever you're after (but sometimes it sure takes a lot of patience)

Cheers, bad_vlad