I have an ALL70 sound bar with a new Panny TV and Panny 4K Blu-ray player. The All70 when I hold the Sound button for 4 secs shows 'PCM' even with a Dolby 5.1 Blu-ray disc when it should show 'Dolby Digital'. I'm using all the right HDMI connections and I believe all the right setups on each device. Any ideas?