SarahSurreal Please test with no mods just to be thorough. You don't need to save your progress.
If that doesn't help, please move Options.ini out of Documents > Electronic Arts > The Sims 4 and onto your desktop, to allow the game to create a new version. Don't change any settings, all of which will have reverted; you can trash the new Options.ini and restore the old one when you're done testing.
If that doesn't help either, please test with a different sound output device, one that uses a different type of connection, for example built-in speakers vs. headphones connected via jack or USB.
