Digital BW, The Print

I'm trying to print 20 sets of 29 images that the client wants 
yesterday, but I'm have a random problem that's driving me crazy.
I'm printing to an Epson 4000 with QTR 2.1 thru OS10.3.5. Every once in 
while for no apparent reason it will print about 2/3 to 3/4 of an image 
then stop, back the paper up to the top of the page and start over. The 
paper I'm using is rather thin, so backing it up wrinkles it and causes 
a paper jam which precludes anymore printing until I deal with it. I 
had hoped to queue up a bunch of images and let it print over night but 
now it needs to be baby sat which is slowing everything down to a 
crawl.
Any ideas on what might be causing this? It's not the paper because 
it's done it with EEM as well. Is it a printer problem?  Is it a QTR 
problem? Or does the problem lie somewhere between the keyboard and the 
chair?
Any thoughts on what I might do short of shooting myself?
-Alan