Why does the Audi A8's adaptive cruise control occasionally fail to maintain a set speed?

I've noticed that my Audi A8's adaptive cruise control sometimes struggles to maintain a set speed, especially on hills or winding roads. Is this a common issue, and is there a way to improve its performance?

The occasional failure of adaptive cruise control to maintain a set speed is a common issue in many vehicles, including the Audi A8. This is because the system relies on sensors to detect the distance and speed of the vehicle in front of you, and certain road conditions can interfere with these sensors. One way to improve its performance is to keep the sensors clean and free of obstructions such as dirt or snow.