I have my Fire TV Stick plugged into my Pioneer VSX-1123. When I run Netflix I am getting Dolby Digital 5.1 Plus sound. When I run Plex I am only getting Stereo sound. I have tried multiple movies with DTS and DD5.1 but only Stereo is coming out. Note, this is not a problem with the Pioneer receiver. Through my Samsung Smart HUB with Plex I get DTS and DD5.1 just fine. I also tried plugging my macbook and with Plex DTS and DD5.1 also work fine. This is a problem only with the Fire Stick and Plex. Any ideas how to get better than Stereo out of it?