Arc keeps disconnecting from Samsung TV

I have now given up the eARC connection. I have managed to the optical connection and use the DirectTV remote to control the Arc volume, with the Arc sound coming on when I turn the TV on. Surround sound is still very good using the optical connection and Era 100s for the rear speakers. I can play Dolby Atmos from music sources through wifi, just not hear Dolby Atmos from a TV source. I enjoy the Sonos Arc and the Samsung TV too much to give up either for the sake of the other. 

Have you tried the reset sequence given in the best answer above? It’s important that everything is unplugged from the TV after the reboot — and that the TV be unpowered for at least two minutes. (or the TV will not fully reboot.)

I have followed the advice in this thread, and other threads, about this topic in terms of resetting, rebooting, sequentially plugging and unplugging everything and leaving the TV and Arc powered down for as long as 15 minutes. Using eARC HDMI the TV will not recognize Sonos Arc as an available sound source. Thanks for everyone’s input, but I’m going to stick with the optical connection for now. 

I’m experiencing the same issue multiple drop outs but eventually rights it’s self 

It looks like a lot of people are having Arc disconnect problems.  If you have a streaming device hooked up, a CEC blocker will fix the problem.  The blocker device has to be in-line with the offending peripheral, as far as I know.  I don’t think putting a CEC blocker in line with a cable or satellite box will work.
If you are getting disconnects without a streamer in place, then it’s a real mystery to me.   Since an Amazon Fire Cube is the culprit on my Samsung NEO, a CEC blocker stopped the disconnect.  Interestingly a Roku Express doesn’t cause the problem.  I think, therefore, it is incumbent on Amazon or Sonos to tix this bug.                                                                                                                                                                                                                                   
DH

My sound control using the Samsung remote or Uverse remote one day stopped controlling the volume.  After trying various recommendations to fix the problem, I settled on the multiple suggestions to unplug the TV, Sonos Arc and Uverse receiver/recorder.

After doing that and plugging all back in for power…. all Remotes allowed the sound control again.

Same problem.  Samsung QN90AA and Sonos Arc.  Periodic no audio from TV.  So crappy.

At first I tried to unplug then replug HDMI, but then I got concerned about the frequent replugging and possibly damaging the connector.  So now I pull power to the Arc, and I wait, then replug and it comes back.  Still, it is a pain in the butt.  

My family thinks I suck because my super expensive sound system does not work correctly.  The Arc sounds great, but this problem sucks.  The old Playbar I replaced did not have this problem.  

Please fix.  

Set the TV to these settings:

HDMI-eARC Mode: Auto (set it to OFF if only using the TV’s native apps)

Digital Output Audio Format: Pass-Through

@GuitarSuperstar : 

Done.  The only change was to set the Digital Autio Output to: Pass-Through.  HDMI-eARC was already set to Auto.

I will comment back in a week if there is no loss of sound.  

-PT

Same issue here. Problem is, the system worked great for about 5 months. Then for some reason all went to hell. The only thing I did is get a a Spotify account and started using it on the smart TV App. Since then, I have to reboot the  whole system every day. 
 

I have a Samsung QN55S95BAFXCA.  Sonos Beam Gen 2 and Mini Sub / OS: S2
 

And yes, I have the same issue with my family thinking I’m an idiot buying this expensive setup that never works when you need it.

Let me know if you have any success. I still need to call Sonos for troubleshooting.