ARC intermittent connection loss possibly with Atmos only

Thanks @Ken_Griffiths .  So far no interruptions running straight through the Smart TV confirming that I am running Atmos.  So this leads me to believe it is something with the Firestick.  

Confirmed I have the latest Firestick and LG software/firmware installed.  I did try switching inputs of the Firestick into HDMI 3 yesterday and had the same issue.  What I have NOT yet done is swap out the HDMI cable to the Firestick itself.  Maybe knowing this is now isolated to the Firestick, maybe that cord is causing the issue.  I think we’re gettting closer ha.

May I ask what the Nvidia Shield is for?  From a quick google search is it more of a high powered streaming stick like a Firestick or Roku but more functionality?  Do you watch Atmos content through your Firestick or through your Nvidia?

Thanks again!

Yes Indeed, only with Atmos Content with the Fire Stick 4K (I dont use the built in TV apps). To my knowledge everything is up to date. I had to settle for Dolby Digital Plus 5.1 and that seemed to solve the issue, until I started watching something on Apple TV+ and it did it again, I checked the app and it was indeed passing through Atmos (of some sort). Everything is fine fine until It starts playing "Atmos" Content. I too have an LG TV, from 2019, nothing special but it does have a regular ARC port. 

@Ken_Griffiths  Nevermind that makes zero sense since the Firestick is its own HDMI cord haha.  Let me try another port again just to be sure

@ThatOneDude  Sorry to hear it.  Yes mine only happens with those apps that stream Atmos as well.  Have you figured out a way to stop the firestick from using Atmos?  I wondering if I set the Firestick output to Dolby Digital if that will eliminate Atmos being pushed out?  Hate to lose the quality but my sanity may be more important ha.  Am I correct that Dolby Digital Plus brings in the Atmos functionality?  @Ken_Griffiths  Do you also know the answer to that question?  Maybe that is what I had previously changed (when it was NOT cutting out) that I have now re-introduced switching back over to “Best Aavailable” through the firestick?

Correct - Atmos is carried over DD+, it will not work over Dolby Digital.

Thank you @Ken_Griffiths  and this is confirmed I am not getting signal loss (or whatever it is) when switched to Dolby Digital.  I am currently on hold with Amazon to see what their suggestion is.  I did just buy a new 4K stick so maybe I can try that stick in case something has happened with that particular stick.  We shall see how Amazon responds...so far this young lady has no idea what Atmos is ha.  But we are getting there.  

Stay tuned!

@RaultTN @Mr. T Thank you both for your input. In the beginning I had it to "best available" in the settings menu for the fire stick 4k which was basically Atmos ofcourse, problems started to occur so I changed it to DD+ or below and that basically defaulted everything I was watching to DD+ 5.1 or below (until last night on Apple TV+ which I dont regularly use). So I then changed it (again) to just DD (on the Fire Stick 4K settings menu) and it rebooted on me Once more on Apple TV+ and that completely threw me off because it was ONLY ever happening with Atmos Content yet it happened with just regular DD. After that one instance it hasn't happened again so maybe it was a random hiccup (I hope). DD+ worked fine for me on Netflix and Disney + (basically everything else that I use) but not on Apple TV+ (App) .Yes it was passing through Atmos but it didn't with the other apps on DD+ (atleast on my end). 

So Amazon hasnt a clue.  Her last attempt was to have me transfer another firestick 4K from my upstairs tv and see if it happens...it of course did.

Something else I want to run past you @Ken_Griffiths  and @ThatOneDude .  What about the following two settings:

Match Original Frame Rate: Currently set to “Up to 12 bits”

Dynamic Range Settings: Currently set to “Always HDR”.  I just changed it to “Adaptive” so we’ll see what happens there.  

I wonder if either of these could be causing an issue?  Still strange that it is random when it happens.  I would think if either of these were an issue it would either not play all together maybe?

So back to the drawing board.  

@ThatOneDude  Dont you dare tell me it happened with DD haha.  I may lose my mind if that begins to happen.  How are you defaulting your Firestick 4K to DD+ without Atmos?  My device only has the option of DD, DD+ and then PCM.  I dont see anywhere to single out Atmos from DD+?  Or are you doing that from the Apple TV+ menu?

Thanks again guys.  Waiting for Amazon to call me back to let her know it didnt work trading out Firestick devices.  Yay

Yeah I never have much hope when I have to resort to a near smooth brained conversation with a customer support rep. About those settings, to my knowledge I dont think any of that would interfere but ya never know I suppose, interference can come from the most unlikely of places from my experience.  As for the Defaulting to DD+, I just set it to DD+ (On the Fire Stick menu, since that basically dictates what all the apps will (or should) use for audio) lol, that worked for me on everything I use, nothing went above DD+ 5.1 , The only time it differed was when I randomly kicked on Apple TV+ last night and it was Using DD+ to pass Atmos through. Maybe Apple TV+ does things a little differently? Idk tbh but Once the Sonos App tells me Atmos is whats playing then its a wrap for me and it'll do the reboot BS at some point. As of right now I have it on Regular DD and im hopeful. @RaultTN