either your 3com router or ZA firewall or router/firewall on the server side is closing main connection during long(..ish) file transfers.
on Proxy/Firwall/Ident tab, try to enable "send noop during transfer" option.
or better yet, look an option in 3com router or ZA to increase 'idle connection timeout' value. it might not have exact same name but should have similar meaning..
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