Problem with not all pages printing

Hello, I'm using CUPS 1.1.19 on a RedHat GNU/Linux system. I have an hp 
LaserJet 2200d. For the most part everything works great except sometimes, when 
printing long documents (> 50 pages), printing will stop before printing all 
the pages. The  printer will go back to being ready to print (green light on). 
I set LogLevel to debug2 and don't see any obvious differences between what 
happens with a truncated document and one that printed to completion. And the 
number of pages, at least as reported by one of the log messages that looks 
like:

  D [26/Sep/2003:12:57:51 -0700] [Job 260] 0 %%Pages: 74

seems right. I don't know if this is related but I also have a problem when 
printing long documents that sometimes in the middle of the document, the 
printer will stop printing an the red error light lights. But there's no paper 
jam and hitting the reset button gets it to restart where it left off. (I 
haven't noticed whether this always happens with documents that later get 
truncated. Could be.)

Any ideas what's wrong or how to debug this?

-Peter