Hello,
My wife and I updated the software on our Galaxy S7's on 11/1 and the microphone on my wife's S7 cut out while using the HD Voice and Advanced calling. Also, the LTE signal strength would drop while we were at home and the calls would not go through.
We turned off the Advanced calling and HD voice from her phone and the phone worked fine again. Is there any reason why this should be happening? Has the software for the HD Voice not been updated to work properly with Android Nougat?