I just got a Moultrie D-40 Trail cam tonight at sportsmans warehouse and i put it out on our utility pole outside the house to try and get the neighbors cats and so i thought i would try to trip it by walking by it and the only time i could get it to flash was when i put my arm right infront of it. is this normal with these or did i get a defected one? Any advise about this camera is welcome.

Thanks