Yesterday I bought and installed Samsung QE75QN90BATXXH after using a Sony Bravia for 5 years. Samsung has a problem of auto switching from HDMI audio output to my Yamaha Av reciever back to TV speakers after 15sec every time I select the HDMI audio output! Courious thing is that when I turn on Yamaha AV before turning on the TV then the audio output to Yamaha works fine but also the TV speakers works simultaneously.
My old Sony didn’t have any od this problems.
I read online that this is a common issuse but I didn’t find a solution anywhere.