Volume reduces automatically with external noise

[OldBlade]

I use an app to listen to podcasts when I'm running in the gym but when the piped music gets loud the media volume goes down. How can I stop this happening?

 

[SpookDroid]

Do you have any volume level normalizer or EQ settings? For instance, that option is ON by default in Spotify. If you've activated Dolby Atmos and are using headphones that also might affect how it sounds (try turning it off and see if that helps).