Re: SoundTouch 300 stops getting signal from LG Oled via HDMI ARC when plugging in
I am very sorry to hear this.
At this point I would suggest that you reach out to your local support team for further support with this. Our local support team can be contacted via clicking this link and selecting your region, this will redirect you to our website. Please scroll to the bottom of the website and there you will find a 'Contact Us' tab, this will provide you with all the relevant contact information for your country.
An agent here will be more than happy to assist you further.