I've noticed that my start/stop is also effected by temperatures ... if you drive the car hard for some time the start/stop thing will not work untill the engine cools off a bit. I've also noticed that it's more reluctant to work when the whether is cold. Another thig I've noticed is that it may kind-of crash: when it's not working for no apparent reason if I turn off the engine and start it again it will sometimes restore the start/stop functionality.
I've had the car for 6 months now and for the first 3 months it worked relatively reliably and predictably, can't say the same now !
Overall I find that the start/stop lunatic behavior is frustrating, I'd be looking to have the car start with it disabled by default and then turn it on only when I feel like guessing if it will turn off the car when I stop at the lights or not
