help me about this noise after my car self-shuts off when it gets hot

https://reddit.com/link/1t9829s/video/7o3yisi1ib0h1/player

Hi guys my Opel astra h 2004 petrol does this noise after shutting off when it gets hot (like after 5-6 miles) what is possibly the cause? A mechanic already told me that the shutting off when warm may be caused by many components such as the crankshaft sensor the camshaft sensor or the ecu, but what this noise could be about?