This bug or issue is driving me crazy. Changing the ringtone to any stock ringtone or even custom ringtone works fine until you reset the phone, then after about 2 or 3 min of the phone being reset it changes back to the VZW airwaves ringtone. This happens like clock work every singe time. I have done factory resets and it still does this. I have also seen this on other carrier Note 7s as well. I'm hoping someone is aware of this issue and gets a fix out asap.
Same problem with the new Note 7 I received two weeks ago. Can't find a pattern of why or when it happens but every few days, whatever ringtone I choose reverts back to the Airwaves ringtone and it's driving me crazy.. I set the phone up new when I got it and did not restore from any backups..