I've installed the C720 and set it up in the app. Everything works fine, except the light comes on permanently at sunset. I then have to turn it off manually. 

I have disabled the Floodlight setting, but it still turns on at sunset. I also tried setting it to only turn on at 23:59 and turns off at 0:00 but that hasn't worked either.

I've also rebooted the camera several times. 

Have I got a faulty camera?