I have a new Q80T 75inch QLED tv with a Q900T soundbar connected to hdmi eArc and a Panasonic UHD BluRay Player. I have Signal Input Plus enabled on the hdmi port that the dvd player is connected to. Everything works fantastic and I play the audio through both the bar and the tv using Q symphony. When I play normal or bluray dvds all is good but as soon as I play a 4K disc the sound cuts momentarily every 10 mins or so. After changing hdmi cables and numerous resets I have established that turning off Signal input plus on the hdmi port that the dvd is connected to cures the problem. My worry is that I'm not getting the best UHD picture as Samsung say this should be enabled to get the best from UHD sources? Anybody else had this or know a fix?