Never come across an issue like this before, I would guess it's a coincidence it's happened at the same time.I maybe talking out my bum here but did you screw on the lid of the round plug with the pins? reason I ask is there is something deep down at the back of my mind telling me the car knows if its fitted or not and if its not It goes into a kinda test mode or something like that.
not sure where I read that or even If it was this car
Good call, there is some circuitry in the lid on mine... did you screw on the lid of the round plug with the pins?...