Printing Problem in Win XP

I print a lot of consecutive TIFF images and PDF images. I am finding
that when I print a good number of PDF images back to back that my
LaserJet 4000 series printers are skipping random prints. Sometimes it
will print a blank page in its place sometimes it prints nothing and
just skips right over it. Either way this is a huge problem at my job.
Has anyone ever heard of anythign like this happening? Could it be a
memory problem in the printer? I am very lost here. Another note on
the printers is that they have 36 MB of RAM and are local printers.
Thanks in advance for any help you may have!