Whenever I make a phone call on my Honor 5X (used through T-Mobile), The audio will fade out almost completely for a few seconds then fade back in. It repeatedly does this for the entire phone call. It does it even when I have great signal. I have been using T-Mobile for years and I never had this problem using other phones. Other than this little problem, I LOVE the phone. Has anyone else had this problem? Any ideas on how to fix it?