Can you run the diagnostic tool in your Samsung Members app to see if this highlights any issues @Nasrin
If you conduct a telephone call and switch to loud speaker does the buzz return ?
It's possible the speaker has suffered a malfunction 😔
If this is continuing then get in touch with the supplier of the phone i.e your network if part of a contract ,or Samsung via a Service Centre or Samsung Experience Store or via Samsung via the link below to arrange a assessment and repair if necessary.
In the UK if a phone supplied by Samsung goes past 14 days of ownership then they'll offer a Repair Service under the Limited 2 Year Manufacturers Warranty for free as long as the phone shows no signs externally or internally of an accidental bump / drop or water damage.
If I can be of any further help then please don't hesitate. Take care. 😎
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "