There seems to be a problem with the Samsung Sound Bar losing the ARC signal. This is happening across a wide range of TVs, both Samsung and non-Samsung, and it appears Samsung won't acknowlege it. My rig is an LG OLED65C8PUA receiving the signal via ARC from an Apple TV 4K directly connected to the Samsung HW-K950. Cables are all certified. Problem: when the soundbar is turned on, the HW K-950 will sometimes (randomly, 1/10 times) not recognize an ARC signal. This forces the TV to use its Internal Audio, and nothing comes from the soundbar. It appears to be a problem with ARC negotiation between the Samsung and the other devices. Workaround: 1. Hold down the right side of the circular button on the Samsung remote until it reads "OFF - Anynet+". 2. Now hold down the left side of the circular button on the Samsung remote until it reads "OFF - Auto Power Link". 3. Now repeat those two steps in 1 & 2 above to turn Anynet+ and Auto Power Link back on. 90% of the time this works, and appears to force the soundbar to renegotiate ARC successfully. 4. 10% of the time I will need to take an additional last step, and go to the TV's Sound menu to find that the TV has given up on ARC negotiation and is set to Internal Speaker. Then I have to manually change it from Internal Speaker to HDMI ARC mode. These steps have addressed the problem for a year. However, it is clear that the Samsung firmware needs to have a code update to perform a more rigorous check for an ARC signal. I suspect that this is a signal latency issue between devices and Samsung isn't waiting long enough before the bar gives up. The LG seems to wait far longer and only gives up in rare instances. The Apple TV 4K doesn't seem to ever give up and never needs a reset to make all of this work.
... View more