I have the Sony KD-55XE8596 linked to my Sony SA-XF9000 7.1 Dolby Atmos sound bar until 2 weeks ago was working fine and then I went to watch Amazon Prime film and it came up with a message about copy protection error and use correct lead and now the only way I watch Prime is linking the sound at via Bluetooth, I’ve swapped the leads around, I’ve swapped with different HDMI leads and it makes no difference. The tv is running latest update and the sound bar has been update to latest firmware as well. 

 Edit: Just checked and TV Model under help button says KD-55XG8505, Software Version PKG6.3598.0516EUA