This is apparently a very common issue, one which I have found no resolution to. Every time I pause in Halo 4, the environmental, dialogue, and cutscene audio cuts out and does not return on its own. The only way I have found to make it return is to exit the game to the main menu, and to resume at my last saved checkpoint.
This is a very annoying bug, and the prevalence of it on message boards dating back to 2015 at least is very troubling.
I even uninstalled and reinstalled the game, to no avail.
Anyone found a fix?