try it in safe mode. if that is still happening and since you did a factory reset, then it is most likely a hardware issue and will require what @mikedt suggested. either repair or replace the phone.
I suffered the exact same problem with my S8+. I tried all the tricks and finally took it to a repair shop. They replaced the microphone but that did not fix the problem. Fortunately, they refunded my money and I traded the phone in for a new phone. I wish I had some clever suggestion to try. I hope your results aren't the same as mine... unless you are in the mood to replace your phone. Good luck
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