I've had the p20 Pro for the last 4 - 5 months and noticed recently whilst facetiming a family member that there was an issue with them hearing me when I was speaking. I initially put this down to poor reception. However it is becoming apparent that it is not to do with reception but my phone. Those I video call are having to lip read. Please could you advise me how I rectify this. I've gone through all sounds settings.