iPhone 7 and audio ducking problem

Hi folks its Carlos,
I just got a new iPhone 7.
I found that when I ended a phone call voice over would start talking at a lower level then gradually get louder.
It also happen when I left voice messages on vorail and roger.
Also after music.
I was told to turn off audio ducking and I did that but the problem still exists.
Has anyone else here had problems with iPhone 7 ios version 10.2 and the audio ducking.
Happy new year everybody.
Carlos