I purchased by Weber Summit S-470 a few months at and have used it three times now. Every time I’ve used it it’s been daylight and I have not used the control knob lights. However, after I turn the gas off and come inside the control knob lights come on automatically after an hour or so. I go out and push the black button on the left and turn the lights out and then an hour or two later the lights come back on. I turned them off again before going to bed and when I get up the next morning the lights are on again. So, what am I doing wrong in turning the lights off that I never turned on in the first place.