The motion detector is probably set too sensitive. It can also be triggered by a leaky window as it detects the warmer air flowing past. Please check if there is a source of airflow such as a window, door or heat pump nearby. If so, turn the motion detector away from the source. The same counts if there is a tree, bush or animal in the scan area of the motion detector.
For the brennenstuhl®Connect spotlights with motion detector:
Please set the sensitivity in the app to Near.