We got our TV at Costco, too, a few months back. A few days ago, I noticed the sound was different while watching Netflix. The audio sounded like it was all coming out of some kind of canister (cans on a string, maybe ...?), I connected up a small Bluetooth speaker that I know has great sound and it had the same problem. I opened the audio & captioning settings within Netflix app on my Samsung Q7D TV and it was auto-set to Dolby 5.1. I changed it back to original Dolby and the sound is perfect again. Every time we pause, rewind, FF, open a new show within the Netflix app, the audio switches back to Dolby-English 5.1. Every time I manually change it back to regular Dolby-English, the sound is perfect again. For some reason, it defaults to Dolby 5.1 and I haven't been able to find a way to adjust this setting to auto-select. I am 99% certain this is an issue with the newest Samsung firmware update. If you are able to switch the audio within the Netflix app, see if that temporarily fixes the issue until either Samsung or Netflix puts out a fix for their most recent bug. I do not have any issues with audio when watching through Dish receiver or Amazon Prime Video, haven't tried using Hulu or Disney+ yet if it is the app itself or coding between different audio settings that distorts the sound. I did a different search in the Samsung forum with "Samsung Netflix audio" and quite a few people are complaining of issues between their Samsung tv and various audio bars or AVRs that appeared recently after Samsung rolled out a new update. Since this TV has great sound already, we don't want or need any external audio devices. If Samsung or Netflix don't repair the problem, this TV will become an expensive screensaver display or will be returned to Costco.
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