This is most certainly because you have reached your max OS filesize limit.
What is your OS ?
I unix you can set ulimit -f unlimited to have an unlimited file size for that sessions.
Hard and Soft file size kernal parameters can be set to unlimited for the whole system if you wish, talk to your Unix SA.
ulimit -a usually shows you current settings.
There are also other ways of generating an export fle less than 2GB's, one way is to split the exports up. Search forums on how to do this, there have been many threads on this subject.
Once you have eliminated all of the impossible,
whatever remains however improbable,
must be true.
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