Need Help SummaCut D120

Hello, Have shaking blade holder while cutting, when not on moves smoothly all rollers and belts, removed blade holder and ran test print and still shakes while cutting, eliminates blade holder cut strip or blade, motor maybe? cuts fine , throwing no errors . this is the older grey D120. running windows 7 pro 64 bit , flexi 10 and gerber omega 6.5 CP summa cutter control working like a champ as it should. when i do an actual cut it is slightly perforated but still cuts

 

Your Right! needed to clean the rollers and glide that guides the cutting head! Working great Again
Thank you So Much