I am not sure how to debug it. I was printing the ITU X.690 specification and ended up with paper jams twice. At first I thought the paper source is just too full, I removed paper, printed, jammed again. Is it possible that there is a bug sending an 'empty' page to the printer?
I tried to do manual duplex, so it is kind of important to just load and release an empty page. Any idea how to debug?