After a recent update, many users are reporting that their soundbars have become unresponsive and cannot be reset. The issue seems widespread, with numerous people unable to control the soundbar through the remote or buttons. Even the reset combination fails to work, leaving users frustrated as the soundbar displays an error message and remains frozen. The problem persists even after attempting various troubleshooting methods, such as using the SmartThings app. This software glitch has rendered the soundbar unusable for many, leading to widespread complaints and issues across different regions, including the United Kingdom.
https://us.community.samsung.com/t5/Home-Theater/Samsung-Q990D-unresponsive-after-1020-firmware-update/td-p/3168571