Activity Zones allows you to mask off certain regions to prevent excessive motion clips or false alerts. This feature is great if your cameras are outside and you have a tree or bush blowing in the wind triggering a motion clip.
If you're experiencing issues with Activity Zones, it's important to understand how Activity Zones works. The way Activity Zones detects motion is slightly different than a typical clip. In a typical clip without Activity Zones enabled, the camera uses only the PIR sensor. The PIR sensor detects changes in temperature in the image to know when there is motion. So if a person walks past the camera, that person has a different temperature than the background image that the PIR sensor has been looking at.
With Activity Zones, the camera not only uses the PIR sensor, but it also analyzes the actual image to look for changes. To explain this, we'll use the same example as above. If a person walks past the camera, the PIR sensor detects the changes in temperature. When Activity Zones are enabled, the camera wakes up for 2 seconds. During those 2 seconds, the camera analyzes the 2 seconds of video and looks for pixels in the images changing. If the camera only sees pixels changing in the gray (inactive) zones, then the camera turns back off and stops recording. If the camera sees pixels changing in active zones, then the camera continues to record and will send the notification.
The reason that this is important to understand is because in certain situations, pixels can change in active zones when there technically isn't motion. An example of this would be if your camera is pointing toward the street, but you have all of the zones with the street disabled. During the day, Activity Zones will function as expected. However, at night, the car's headlights could shine into active zones, which would be perceived as motion by the camera, as it would see pixels change.
To fix the above scenario, you may need to play around with the positioning of the camera, as well as the zones that you have enabled/disabled so that you can find out what works best in your environment. If you continue to see issues, you can submit a ticket to Tech Support here.