So i used my rear window heater button the other day and turned it off when i parked at the end of the day. The next morning i turned my car on and the heater button lit up and was on. So i turned it off, drove to work and parked. When driving home i turned on the car all is fine, parked at home but then the next morning when i came to turn the car on the button was lit up again. I had the exact same happen again today where it only seems to be 'on' when i start the car in the morning which seems really weird. Any ideas whats going on??