My iOS CAPX that I've sent to you, does not use any third party plugins.
The problem is squarely due to the previous Music "work around" code.
playMusicAsSoundWorkaround = true;
Changing to false; fixes the random crash bug. As IJCT has noted, doing this also fixed his lack of audio problems.
ie. With iOS10, there is no longer a need for prior hacks to get music to work, and the presence of such workarounds is now causing conflict.