Just to get a better picture, audio is playing properly and then when you set the volume to max then the audio is being paused automatically without doing anything else?
The volume that you are setting to max, is it the phone's volume? while on AUX?
*If that is the case then I think I experienced this before and it has something to do with High Volume Warning. I haven't encountered it on our AF2 since I got it. Simple because I do not set the volume on max on my AF2 since I can easily control it on the BT speaker or AUX speakers that I am using. On headphone/earphone, 8/10 volume level is loud enough for me.