If you have been pounding the RIP for awhile, you may want to defrag the hard drive. The newer computers have large enough drives that this should not be a problem, but it won't hurt. Also check to see how the virtual memory is set. Even if you have 3 to 4GB of RAM, XP seems to want to set this very low. This could cause the RIP to have to right to the hard drive for large complex files, especially with trapping and this could cause an error. Make sure it is set to at least 1.5 times the actual RAM, or change the setting to let the system handle it and it should fix the amount as such.
If none of the above help, I would say that you have found an issue that hopefully will be addressed by Global Graphics or Esko if they can figure were the problem is.
There are always going to be issues with some files and a work around is necessary. If anyone says their solution is a wonder workflow and will work with ALL files, run, and run fast and far...............