The audio stutters when connected to a bluetooth head phone on iOS

Question

We don't find the right configuration on iPhone to run the game's audio with bluetooth headphone without stuttering and especially when the user has a other music app playing.

We want to shut down the music of the game when the user has another music app playing, at first we find what to enter in code:

platformSettings.audioSession.eCategoryOptions = AkAudioSessionCategoryOptions.AkAudioSessionCategoryOptionMixWithOthers;
platformSettings.audioSession.eCategory = AkAudioSessionCategory.AkAudioSessionCategoryAmbient;

But that makes the sounds stutter even more when using bluetooth headphone