We have had our Duplo PUR 2000 perfect binder for about 10 months and we have had continuing problems with the glue length consistency since we acquired the machine. Approximately 20% of the books we bind are effected. The glue cuts out at various points in the book. Some times it is only by a couple of centimeters and other times by half the book. We have had numerous service calls and still the problem keeps occurring. Has anyone else had this problem and if so what was the cause. The is turning into a nightmare for us, the cost of reprints is absurd.