Recently purchased a 9n Tdi sport but for some reason every time I leave the car over night the trip computer resets it's self like doesn't store my average mpg etc is this normal? (If it is that's annoying) or does it have a problem?

Cheers in advance

You have two settings on the trip computer, quickly press the reset button on the bottom of the wiper stalk to switch between the two. One, resets every time the car starts and stops, Two, is your overall average. Took me a while to work that out as well.