Dropped line segments in dxf files

I have recently noticed when opening large E size dxf files which were created in CAD programs that some entities are dropped. At times it is dropping critical artwork.
I am suspecting there is a limitation on the amount of line segments Illustrator can import. Has anyone else experienced this before and is there a solution?
Thanks,
Mark

Sorry Kurt, I should have mentioned that in my original message.
I am using Illustrator CS2. We use multiple CAD programs but most of the drawings come from UniGraphics NX3 & NX5 or an older Unix program named DDN (Design Drafting Numerical Control). The dxf's are created from a viewing program developed by Cadman Corp. named Viewport. The files are plotted from the CAD programs into Viewport then they can be taken from viewport as dxf, pdf, or IGES files. We experience the same phenomenon from the pdf files only worse and the IGES files cannot be opened in Illustrator.
The missing artwork is present when viewed in Viewport or if we open the same dxf in SolidEdge. The results are not consistent from file to file, sometimes artwork is missing other times no art is missing but we have not been able to come up with a pattern other than it only seems to occur with larger 'E' size drawings.
Thanks for your help,
Mark

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