I have a several years old LG SK4D soundbar, connected to a 2016 OLED TV. Lately, several problems have developed.
1) The bar will seem to stop working every once in a while through the optical input. I finally went to bluetooth.
2) Probably the most head scratching problem: It will start very loudly playing some radio program when both the soundbar & the TV are off. This has happened very early in the morning and during the day. The only way to stop it is to unplug it. I have no idea why.