Print Errors - Details going missing

I've noticed several times that when printing a large number of vector drawings, individual elements can start to go missing. 

Example: I'm printing 5 sheets with 35 buttons per sheet (each button is an identical logo made up of grouped lines and shapes), and half was through the print a line or two will go missing from a few of the buttons. Then the whole logo is gone and the printer starts spitting out blank pages. To make it more confusing, sometimes I hit print again (hoping to get enough to fill the order) and the entire job prints just fine! 

Any thoughts? Anyone else notice this?