Laptop ventilation rattles?

As the title suggests, my laptop ventilation suddenly started rattling very loudly. Then I switched off my laptop immediately. At the next start the rattling is almost completely gone, you can only hear a slight rattling when you listen very carefully. The laptop is practically new and now I want to find out what can be done there? Why is that rattling? Can it be that the problem will resolve itself again? The guarantee is still on, is there anything I can do so that everything is normal again or does it make more sense to redeem the guarantee right away?

If there's still a guarantee on it, it should be sent in with the description of the problem.