I think the problem is HDMI-related, but it's more that the TV is telling the player it can't accept DTS, and thus the player is cutting output.
You could try turning off the Anynet+ HDMI CEC control between the TV and player, as this may sever that link, and also set the audio output to Bitstream.
Consulting Editor, What Hi-Fi? Sound and Vision / whathifi.com
Audio Editor, Gramophone