I always thought that HDMI is a very bad standard. Many people have such comatibility issues, and in most situations these problems are due to HDCP.
Have you any splitter or similar device? If so, you can try to connect it between Viark and soundbar and check what happens.
If this will not solve, the following step would be looking for a "magic" device to clean the signal from HDCP. In the past HDFury did the job, don't know now.
Nah no splitter, well actually there was a hdmi extender. One of those ones that you get with the firestick. Just because TV was tight to the wall. But I remove that.
My setup very basic
Phillips 4k TV hdmi earc input to the JBL
JBL 9.1
Computer that is going to the hdmi in
Nvidia shield hdmi to the TV
Viark hdmi TV
Xbox one going to the TV
What I did try
Replacing hdmi cables - viark switch off
Putting viark to Xbox one hdmi input - box still switch off
Viark to the JBL hdmi in - vark still switched off
Turning some of that simple link off on the TV
Turned hdmi cec off on viark
Replacement power brick
Tried downgrading the firmware to earlier versions, actually thought the hdmi cec update broke it.
But what I had noticed a few times audio on the TV would switch from sound system to internal TV speaker. The TV could be on Nvidia shield input. On the TV sound setting, I was unable to switch the sound from TV speakers to soundsystem.
Only 2 fixes, restart TV/soundbar
Or disconnect the hdmi cable from the viark.
I have been currently testing the viark with only using the TV speakers and it has not switched off once. Goes into standby but I'm able to come out of standby.
I think the box has a issue with hdmi , not quite what. I know my other devices all work fine. I've also another stb, xtrend which works with the setup. Not quite sure why the viark has a problem
Anyway perhaps it will help somebody else.
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