Cold start , metallic hitting after 40 sec

Hello , I’m new here and have a question , Could be that the question has been asked a few times already . But I did not find a suitable answer . So I bought me 6 months ago a Golf 6 1.4 suction cup . Km now 43,000 for a few weeks I have after the cold start 40 seconds a metal beat in the engine . It disappears when the car is warm . Ü After three oil changes and uses of an adjective it did not get better . Three workshops , three diagnoses …. 1 times hydro impact 1 times bearing damage 1 times there is normal with the engines My problem is that I should pay 800 euros and no one can tell me if it is after it is gone . Therefore I hope here on experiences and maybe a good advice . I try to upload a video , so takes 2.2 minutes . As said the metallic noise starts only after 40 seconds . Thank you already in advance ….