brightness changes -- false motion detect

[PoorOwner 0]

I am using a DVR system with bullet cameras and it seems the cameras have the ability to adjust brightness on it's own. Each time it does I get a false motion detect..

 

I am not sure what I am doing wrong, maybe a cable problem? or is it just caught between the auto adjust sometimes.

 

Another cause would be a cloudy day with the sun shine going on and off. I pulled back the shield for the camera since it is under a eave anyway seemed to help reduce / stabilize the auto adjusting.

 

Thanks for any tips you may have..