QTR-Quadtone RIP

I posted in the past the same and couldn't solve the issue :

It happens regularly that when I send a job to the printer with QTR, 
the sheet of paper gets pulled through the printer without being 
printed at all. I cancel the job, restart it all until the printer 
prints (sometimes it goes fine sometimes I have a repeat of the same 
issue and keep on trying till it goes ok).

Settings :
XP, CS, QTR (lastest release), 1290, Piezo, file measurements always 1 
or 2 inches smaller than the media, single job at a time, loaded with 
file/open, 3 printers connected (but this does not seems to be related 
in anyway, they can be on or off without affecting), flatened Tif 
(compressed LZW) in greyscale 8b...

Any suggestions ?

Olivier