Hi Boni,
You may try updating the latest audio and touchpad drivers.
Click on the link http://dell.to/QjjZDA -> Type the service tag of computer -> Select the operating system installed on computer -> Expand audio/input -> Cirrus Logic High Definition Audio/Dell Touchpad AXX -> Download/install the file and restart the computer when prompted.
I would request you not to share the Service Tag information on open forum as it is considered personal information.
If the issue persists, please share the operating system installed on your computer.
Hope this helps. Do reply with the information if you have any further questions.