Also semi off topic but the Member to Member Classifieds Help Wanted section is for members to post help wanted ads, as in "Now Hiring". Not so much for asking for help with something specific like this. Many might not see a question asking for help posted in this section and you might get more replies if this were posted in the Flexi section instead since more will be looking there.....
No biggie - just mentioning this is all....
We do use Flexi but that that brand cutter but as others mentioned. Best I can think is to be sure the grit rollers are not clogged up, slow the various cutter settings down (Summa has many like feed, acceleration, actual cutting speed, etc) for longer jobs where accuracy is lacking.