Bit of a weird one. I have a MK7 Golf 2L on 80k miles. Drives perfectly fine but quite often, on the first startup, it starts then turns off. If I start it again it’ll be fine. Why does it turn off? Stop-start is turned off and it doesn’t crank unusually. Cranks and starts straight away but will turn off straight after startup. If I start it again, it’s ok. Any idea what it could be?