Error Importing Created WordPress File

I’m trying to transfer a database of pages (159) into WordPress. I finally got all the input setup right and the file reading properly. However when i start the import at the first page – WordPress stops importing the pages after the 42 page. If I were to start the importing at the 40th page it will run until the 102nd page.

Does WordPress grab a chunk of code and run that through the importer or does it go through the pages one at a time – ie could there be an issue at a random page and it just happens to crash at the 42nd page? Has anyone else tried to create their own WordPress file in order to import pages?