Sound lag on IOS

I can run my awesome ionic app on android with no problem.
On IOS, it work perfectly if i disable sound. If sound is enable, each sound playing make the app lag…

I use the HTMLAudioElement like this:

audio = new Audio('/assets/sounds/mySound.mp3');;

An error message say on xcode:
Failed to acquire RBS MediaPlayback assertion ‘Webkit Media Playback’ for process whit PID 1416

Do you have an idea of what happen (i suppose this is a question of thread) ?