Start/stop drives strange things

Good evening all around My name is Ralph, I live in Switzerland and since last summer I drive a 2013 V70 DrivE with man. Gearbox and now almost 100tsd km. I find the start/stop system actually quite good. However, it does not work with me properly. I thought that was due to the cold temperatures and a possibly somewhat tired battery. When I strangled the engine recently, the system started the engine without murmuring. I then got the car under pain still two It worked out again every time – green lamp came and the engine went on. Before the traffic lights (unlock the gear) nothing happens and the engine continues to run. Does one of you know that? I know, this system is not very popular here, but I want it to be as planned by the manufacturer… Thanks for your feedback and nice greetings from Bern Ralph