Streaming content is rarely without hiccups. While you can always test out other audio settings (something I often recommend), it mostly hinges on internet traffic.
That said, try listening without the soundbar, and also using a wired (ethernet) connection.
Last week I was watching the new 'Iron Fist' on Netflix, and I was having sound issues. The sound would be fine one minute, but then something like a high action scene started, it sounded like half the sound was cut off. Whenever I watch older shows, there are no problems with the sound. I have a vizio soundbar hooked up to the television (Sony Bravia 4k HDR KD50x690e). If it is a settings problem, I am not certain what they should be on.

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