@joseph_1979 Thank you. I'll give it a try tonight but I don't understand why this doesn't happen with my other 3 RLC 811A cams when the ambient light is the same as are the settings. Will let you know how I get on.

I have 4 Reolink RLC 811a IP cameras.They all have the latest firmware update, have the same settings for lighting, motion detection etc but the last one `I purchased just 2 days ago is turning the IR lighting on and off randomly at night.