guMBy

I have a 2011 CPO GLK350 which I purchased in September. I also purchased the three year extended warranty. Now, whenever it is colder than -10C in the vehicle, the right turn signal acts up. When the stalk is first pressed upward into the locked-on position, the left signal quickly flashes once and then the right signal starts flashing. After completing the right turn and the steering wheel returns to centre, the stalk returns to the off position as expected but flashes the left signal three times like when you lightly press it to lane change. It will do this even when you try to cushion the return of the stalk when it cancels. This behaviour stops when the cabin temperature warms up, usually after about 15 minutes.
Has anyone else seen this happen? My original 80k warranty is up soon and I wonder if I should rush to bring it in to MB, or if my extended warranty will cover it and I don't have to worry.