My sister bought a Samsung 4K TV along with a LG 4K Blu Ray player (UBK 80) last September. The Blu Ray player has HDMI, and also a USB connection. Hooking up was simple and everything; CD's, DVD's, USB and Blu Rays, played great. We connected pair of THX-certified speakers we had though an adapter. Perfect sound and music. Quite enjoyable to be able to play all these medias. Recently (last night), we popped a DVD movie we had bought. Then, as the movie started, a horrible screeching audio distortion came out of the speakers. Then after a few seconds, the distortion changed, and the DVD stopped. First thought: a bad DVD. so we fired up a second DVD. same result. A third DVD. Same result. Then we played a regular Blu Ray movie. Same distortion, albeit with faint regular audio playing with the distortion. We played a 4K Blu Ray movie. Same thing. We changed the audio outputs in the Audio Menu of the Blu Ray player. Same result. We then setup the TV audio settings so that the audio would play through the TV's speakers. Same distortion. Next up, we played videos from the USB source, which is connected to a small external hard drive. Perfect sound. I played all the discs we tested on my computer, and they all play just fine. So, at this point we believe we're facing the possibility of a faulty Blu Ray player but we thought perhaps someone might clue us in on a solution.