I have enjoyed this sensor for approximately 4 months, but recently it has been switching on and off on its own with nothing to activate it. Is there anything I can do to stop this. Obviously it is useless if I can't fix it.

Thanks
Richard

If you look at the reviews on this product, they are not really that great. Problems with sensitivity. These are infrared so heat from a supply register too close to the sensor can cause it to come on. Nothing you can really "fix" so you might replace it with a different switch.