Your groomer requires regular cleaning to function properly. Hair or debris can get stuck in the device and effect 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. Do not use soapy water or any cleaning detergents, as this can remove the protective grease on the cutter and effect its performance.
If your appliance is not washable, clean it with the small brush provided with it or use a cotton bud.
Wash and dry the attachments separately before reattaching them to the groomer.

Watch the instructional video below as an example to learn how to clean your groomer properly. For further cleaning instructions specific to your model number, refer to the user manual. 

It can be that your groomer has not been assembled properly, which is causing it to make a strange noise. Take off the trimming or cutting attachments that you are using, and put them on again. Follow the instructions mentioned in your user manual.

We recommend oiling your groomer every 6 weeks. You can put a drop of oil on the teeth of the cutting element of your groomer. You can use the oil provided in the packaging or any other sewing machine oil.

If your groomer is running low on battery, then it may sound odd to you. Please fully recharge your device before any further use.
In case your groomer runs on disposable AA batteries, it might be time to replace the batteries. When replacing the batteries make sure you use the appropriate batteries for the device as mentioned in the user manual. Do not mix different types or old and new batteries. When putting in the batteries make sure the + and - poles point in the right direction.
If the advice above does not solve your problem, then contact us for further help.