I own a Duplo DP31-S duplicatior and when cutting masters I usually have to do 4-5 per print and everytime i do a master a line or 2 appear that runs right through the page. If the page has text in it distorts it and makes it unreadable. Have tried changing master rolls, cleaning machine but no luck. Would any of you have any suggestions as going through so many masters/ink/paper because of this.