Thank you for this question. I understand your concern and would like to walk you through trying a Reset on the TV which should also reset any audio issues you may be experiencing.
I've attached an image to help you navigate to the reset in the Menu Settings.
Please see below and if this answer helps please be sure to mark this comment as a solution.
Please navigate using remote to TV menu
MENU>SUPPORT DIAGNOSTICS>SELF RESET
Be sure to click " ✓ Accept as Solution" when you find an answer that works for you.