Spot Light Cam Light keeps coming on at night

The light on my Spot Light Cam Plus keeps activating at night without motion being detected. It appears that cars travelling along the road are triggering the security light even though the settings for motion are well away from the road. The road itself is outside the trigger zone set in both camera mode and Birds Eye zone. Is there a way to reduce sensitivity of light switch as clearly this is not linked to the motion detection zones?Thanks in advance for any support.