Samsung S9 - Niveau du microphone trop bas / Microphone level too low

Bonjour .
Lors des appels téléphoniques le niveau du microphone est trop bas. Que puis-je faire ?
Samusung S9 vendu par , système à jour.

Hello .
During phone calls the microphone level is too low. What can I do?
Samusung S9 sold by , system up to date

Hi, I had this issue with my refurbished S9 bought by the /e/ foundation also. Telefon conversations were hardly possible because of the low microphone level and a lot of spoken words were missing. Right now I am waiting for a S9 exchange device and I hope this problem is not a general issue with the S9.

Thank you.
I will contact the support.