Been cutting sandblast resist with pcut630 for about 5 years. It has worked well until a few months ago. It cuts but cuts sloppy. I have taken machine apart, cleaned and inspected. Nothing appears to be loose. The gears , belts all seems to be good. Checked all allen screws also. Can the mother board develop a glich or become bugged . I have always had the idea a computer chip works or doesnt work, no in between. I cut 25 mil material with a 60 degree blade and replace blades often. Arcs and circles are loosing their smoothness. Letters are becoming distorted,ie, a circle in a circle lacks a parallel thickness. I know cutting this material gives it more of a work out than vinyl so have cut a design then put plotter pen in and plotting has the same issues. Was just wondering if anyone else has had these issues or has any suggestions. Thanks