I've experienced similar instances with sound dropping out. I figured out that while Samsung has done a great job with ATMOS and delivering a true "3d experience" Sadly, not all shows and movies are recorded under that same process so channeled sounds that would normally come through the front sometimes never come at all which is due to the fact of the 2ch delivery. that's why with other Soundbars that are less equipped and set at a 2Channel Stereo you will hear sound as opposed to Atmos where when a truck is coming from behind in the movie it wouldn't make sense to hear it coming directly in front of you. I would try changing your presets to 2 channel just to be sure you are getting sound through your speakers correctly and keep in mind that some audio video recordings aren't as far advanced as the technology that you have purchased so Hope's of getting Fried Green Tomatoes in 3d when it was recorded in 2 channel stereo just isn't feasible though there are presets that enhance the audio. I personally dont own any Soundbars from Samsung but own several Home Theater Systems and know that it sometimes takes a bit of tweaking depending on what devices which hardware and what type of material you are using. I even have a Sony system with the same trouble as you are having where I will have to cycle through the presets until I find one that works well with the tv, a dvd, pandora, etc . it's just the recording and delivery
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