Newbie here too, well a couple of weeks old anyway.
I'm assuming your on about the Eco function, stopping and starting at traffic lights etc? Had the same issue with mine, till i found out it doesn't always work, it's all according to various circumstances what's going on with the car apparently and it also has it's own battery, so lot's of blipping around town, will lose it's charge, but longer rides, you'll find it will works fine once it re charges back up.
It's very vague in the manual what circumstances it will work in, but it think it's down to if the heaters are on full etc, stuff that need the car to be on to be working. I could be wrong though.