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The only time I've seen this happen is when some very old interface scripts were copied up to a new version. I never took the time to look at the scripts to see why they weren't working, but apparently they'd hang for some reason, so lp would assume a printer fault, stop the job, wait a bit, and then send it again. And again, and again.. Replacing the interfaces with current versions fixed it instantly.
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On two occasions, I have been asked [by members of Parliament], "Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?"...I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question. (Charles Babbage)