Cant hear phone calls (Ear Speaker or Loud Speaker) in certain areas?

Cant hear phone calls (Ear Speaker or Loud Speaker) in certain areas?

All hardware works perfectly fine, tested.

Tried factory reset + full stock firmware flash.

Still has issues, only on a phone call - ear speaker, loud speaker, and even headphones - cant hear person on other end. Mic works fine, they hear you. Again, this only happens in certain areas in the city.

Can anyone confirm what is causing this? I suspect a failing or failed cellular ic chip?

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