I am having a strange audio issue with an Anthem AVM60 and a Hisense U8N 75".  They are connected using the ARC channel.  I have run the signal in two ways:  Roku to AVM60 to Hisense.  This has no issues.  The other way is to run the signal to the TV (ethernet connection) and then to the Anthem.  When I do this, the audio cuts out at random intervals (between 2 and 10 minutes) for about 3 seconds each time.  It's extremely annoying.  And it is source agnostic - Apple TV, Netflix,  Prime Video etc. all experience this issue.
Unfortunately, I prefer to run through the TV because that allows me to bypass the Roku and use the TV remote to manage everything.  Using the Roku means I have three remotes - one for the Roku, one for Anthem (volume) and one for the TV if I have to play with settings.  Since the signal works one way just fine I assume I can I rule out cable and connection issues.  So is there some audio processing problem with the TV? Is there a software issue between the TV and the Anthem?  I'm  stumped on how to proceed with this and would really appreciate any and all thoughts y'all might have.  Thanks!