Exporting to Cuts Sudio

I need a few idea people.

I have a Roland GX-24 plotter ( purchased in 2006 new)

And I use corel draw x6 cutting with Cuts Studio.

Recently whatever I send to cuts studio with curved text .i:e o,g,d, s

is cutting jagged. I have tried more nodes and less nodes neither helps much.

Changed the blade. Head does not have any play in it. 

And if I zoom in on the text in corel it is fine, but when I zoom in on it in cuts studio

The curves are jagged. And idea's what is causing this?