Floodlight Cam lights - turning OFF then ON every 30-45 seconds?

I just installed a new Floodlight Cam light in my backyard. It is a part of a group, with other motion lights. During the day, all seemed fine - but now it is dark, my floodlights keep cycling ON and OFF every 30-45 seconds? There is nothing in the history, indicating any motion was detected. There's no motion in the yard at all right now. When I do go outside, it does trigger a motion alert (and the associated actions for the group are triggered - turning on all the backyard lights and all this shows in the history as expected). The question is: why do the floodlights cycle - when nothing is being stored in history? If it were motion - that would show in the history (and does). I shut off the power and reset the device - it still cycles ON and OFF. The latest firmware is installed. Connection to the bridge is fine too. I am able to see this camera on my website dashboard. Can you help determine what is going wrong here?