I have a ceiling PIR motion sensor fitted in my cloakroom that sometimes causes my kitchen lights to turn off when the sensor is triggered. Basically, if my kitchen lights are on and I walk into my cloakroom they sometimes switch off. This doesn't happen all the time. The PIR itself seems to be working as it should as the cloakroom lights always come on when the sensor is triggered. The kitchen lights are all on a dimmer switch. I know nothing about these things and the electrician who did the installation is also baffled and didn't believe me until I showed him a video. Unfortunately, he is not willing to help. Any suggestions as to why this would happen would be greatly appreciated. I'm more than happy to provide more information if required. Thanks!