Sporadic: cracking, hitting, clacking even with engine.. ?

Moin people. I have a little problem. My F56 SD from 2015 occasionally makes funny noises from the engine compartment. First to the car: 2015 Mini F56 SD with 170hp, 2.0L diesel and 225,000km. It does not light up any warning message, there are no errors, the car has full power and drives as always. The error cannot be reproduced, comes at least every third engine run – and goes on even a few seconds – although the engine is switched off. It doesn’t matter. whether climate on/off and it doesn’t matter if the engine is warm/cold. I once made a video of the noise. Does any of you think of something? For me, this could be a actuator? AGR? throttle flap? But then without a message? I am Ratlos.https://youtu.be/_eus4HTKvEQ?si=Cjl8fVgt_zs473-c Thank you.