C30 Start/stop without function

Hello Elchfreunde. I’ve had my C30 DRIVe Kinetic D2 for a good 7 weeks now and I’m really thrilled, especially from the noise level, had a Golf 5 1.9 TDI before and it was unbearably loud compared. But now to the problem, my start/stop doesn’t want to work! So far I drove a good 3000km and he switched off exactly 1 time after I drove 600km of highway at a distance. That can’t actually be, right? The car is Ez. 8/11, 6 gear and has now run a total of 37tkm, I drive 23km a day per way to work, the temperatures are currently still quite mild, so actually there should do something, right? I bought it at the Mitsubishi dealer and unfortunately also has to go there because of warranty stories. Think they won’t really know the car so well, so I wanted to get n tips here before I make them all crazy. Does anyone have an idea where the problem lies?