Camea light won't go out

On one camera, the light stays on all night. OK, not quite. The light comes on, goes off after one minute,2 seconds later it comes back on. Does that all night. No spiders on camera and no flying insects - last night it was 28deg C. Only once was motion detected - 11:28P - stray cat.I have turned off Lights, Motion Detection, Motion Alerts, and Motion warnings. Still, the lights stay on all night. The light worked perfectly for a few years, so it can’t be AC (on the other end of the house) or trees.