About a week and a half ago, my phone upgraded to Nougat, and since then I have had TERRIBLE sound quality on phone calls. It plays music, Youtube, etc just fine, but phone calls - from the headset - are almost incomprehensible. Each word the other person speaks sounds like pure static, and sometimes I can't hear them at all. I haven't dropped the phone or anything that would do physical damage, and none of the troubleshooting suggestions even touch the problem. I'm about to try a factory re-set, but am hoping there's something else out there. Any help would be VERY welcomed!
Here are a couple things I would try/suggest:
If you try all this and still have issues the device may need to be swapped out.