Q30 it changes modes by itself

I’ve been using the headset for 1 week and the software is up to date. When in normal mode or in noise canceling mode, when a car passes by me, it automatically switches to ‘transparency’ mode and when the car passes by it goes back to its old mode by itself. Although this was not a problem at first, it started to bother me while I was walking on the street. Is this a feature or is there a problem? I know it changes mode when I touch the right side, but I don’t touch it in any way, the headset changes modes by itself. what’s the problem?