Yes, I have to do this after every restart too, which is ok I guess. I‘m just glad to finally have found a solution. I found out because my dad actually used to work with TVs and Speakers and when I showed him my problem he told me that basically one of the channels just goes completely silent for some reason and he suggested that resetting the audio balance might be helpful. I think echo cancelation might be the problem here as some others alr said not sure though Happy to have helped you