Your groomer requires regular cleaning to function properly. Hair or debris can get stuck in the device and affect its performance.
To clean your groomer, take off the attachments and clean the area underneath the attachment. A lot of hair can collect there. If your groomer is washable, you can clean this area with water. If not, clean it with the small brush provided with your groomer or use a cotton bud.
Wash and dry the attachments separately before reattaching them to the groomer.