W204 C250 sedan weird sound after parking

Hi,
I am new to this forum.

Bought a brand new C250 sedan about 2 month ago.
My first Mercedes ever and things were going well with just one little question.
Every time I parked the car after certain time of driving, there is a clicking sound (maybe) coming from the button of the car.
It lasted about a minute and it is gone.

I didn't notice that when I test-drive the car. Maybe the sound was covered by the street noise at the dealership.

Is it normal? or something I need to have it check out at the dealer?

Thanks!