Hi,
Thank you, everyone, for contributing.
As I said, there is no spider webs or any other kind of webs around or in front of the lights.
With the help of "jeromephone" (Thanks), the issue was with the IR light. I turned this off any problem has gone away. To compensate I have turned on the "light switch" in the console (Can't recall the precise name as and I am not at home to check) and this has helped at night.
Little frustrated this was mentioned by support to try...
Thanks all.