The laser photodetector is dirty. Wipe the area of the photodetector window with a soft cloth and repeat the installation of the system.
In bad weather (rain, fog, snow, etc.), in case of wheel spin, in case of non-compliance of the wheels with the requirements, etc. When the weather returns to normal or you enter a normal road, reset the system.
Note: In the above cases, the operation indicator flashes at the same time «CRUISE CONTROL».