Hi, I have a bathroom pir installed for about 8 months and has been working fine. Last month it began intermittently coming on repeadly .I adjusted all the settings for the lux/sensitivity and time which had no effect. I then covered the pir with a cloth then tape to see if really was picking up any movement or heat source .This did not stop it so I then just replaced the pir with a new one. Unfortunately the new one is doing exactly the same. I have tried to cover the new one up as well but it still comes on. Does anyone know of any other reason for the pir to keep switching on?