As you are writing to a new file and not closing the last file - you are running out of buffers. If you close the file when you are done with it - or write the same file I don't think you would have an issue.
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As you are writing to a new file and not closing the last file - you are running out of buffers. If you close the file when you are done with it - or write the same file I don't think you would have an issue.