Mine does the same. It is 3 months old and has not had any software upates yet. When I come to any sort of hill and I have around a third of the battery capacity left, power is reduced and the maxiumum speed I can get is 50 kmh which in a 70 kmh zone is not particularly enjoyable. The temperate is -19 C but this should not affect the car to that extent. The range is also severely reduced in this temperature. The GOM shows 191 km after a full over night charge, and after 10 minutes of heating the car before leaving and driving 23km to work it is down to aroung 100km. Less than 10km later power is reduced and as it is up hill for two thirds of the way home, it is a slow crawl and I have to turn off the heater. By them time I get home, it is down to around 50km range but this range is largely unusable as it is power limited by then. So at the moment in around -19 C, I have a usable range of about 30km. Off to see the dealer this week to see what they say.