fullscreen detection turns itself off.

I have a camera set outside to monitor a few spots around my house. I will get various notifications throughout the day when people walk through my yard and sometimes from tree shadows moving, then it will stop. I go into settings, and the fullscreen detection has turned itself off. This has happened a few times over the past couple days I have had the camera. I got it Thursday, installed the firmware update and set it up. Everything else seems fine, like the nightvision and continuous SD recording.