I've had a lot of problems with EARC between a Sammy Q6 and a Denon AVRX3400H. It worked perfectly for quite a while and I couldn't figure out what all the fuss was about. Then it started acting up. Ohhh boy did I figure out what all the fuss was about! I tried all sorts of things. I tried all sorts of resets, frogged around with every freaking setting in the AVR and the TV, etc. Unplugged and reconnected everything in virtually every possible combination of sequences, etc. Eventually I settled on a specific power-on sequence which seemed to work for awhile, but then it went berzerk on me again.
After being mercilessly beaten down by the EARC gremlins for weeks, I now do everything audio caveman style and stream everything using a Roku plugged into an HDMI port on the Denon rather than the TV apps (I take it you are still trying to stream through your TV apps?).
I've started to wonder if all of the EARC "solutions" people try are actually little more than superstitious behavior similar to that of the pigeons in Skinner's famous experiment. Perhaps us EARC users are unwitting subjects in some crazy version of this experiment? First they starve us of audio, then they F with us by randomly causing EARC to work (that's a joke)(not a funny joke, just a joke)
>>>Skinner conducted his research on a group of hungry pigeons whose body weights had been reduced to 75% of their normal weight when well-fed. For a few minutes each day, a mechanism fed the birds at regular intervals. What observers of the pigeons found showed the
birds developing superstitious behavior, believing that by acting in a particular way, or committing a certain action,
food would arrive. . . . By the end of the study, three quarters of the birds had become superstitious. One pigeon, in pursuit of food, believed that by turning around in the cage twice or three times between being fed, but not just in any direction; the bird learnt to turn anti-clockwise and appeared to believe that this would mean it being fed.<<<
How Skinner's pigeon experiment revealed signs of superstition in pigeons.
www.psychologistworld.com