I have a OLED65E8PUA and Sonos Beam soundbar hooked up to HDMI Arc. It works great. I have a need to add a bluetooth transmitter via optical output. When I switch sound from HDMI Arc to Optical or any other output it jumps back to HDMI Arc.. I can make it work if I disconnect the HDMI Arc Sonos Beam soundbar. Why does my LG TV not allow sound choses with my So os Beam hooked up to HDMI Arc? I reset to factory settings and it worked for one day. Now I can not select any sound output with my Sonos Beam plugged into the HDMI Arc port. Why?