Hmm, then I think our problems are pretty much the same, but with different connection methods as you have wireless I presume.
When the Steam VR view in my video becomes stuttery and you can see audio sources being "shuffled around", that is when the Cosmos Elite is seemingly rebooting and all visuals are lost within the headset itself, turning the screens inside the lenses totally black, as if the headset was turned off. Then a few seconds later it comes back to normal again.
This does seem to be some kind of power management error in the ViveVR software (from what I can gather) as I have been scanning through the SteamVR logs to find out what is going on, and where the problem appears to occur first.
For all I know, this could be caused by a changed value in the latest software for when power is supposed to be cut due to overheating, as I can noticeably hear the HMD fan going a lot. If my HMD was old, I would probably think it was due to a lot of gathered dust, but my HMD is very new so that dust particles is unlikely to be the reason.
I did contact Nvidia to see if they were helpful with this (as GPU control could be a contributor) but the answer I got was simply that my GTX1060 is too bad to run a VR headset on, and then they closed the chat.
I have fortunately found someone not too far away that has the Cosmos Elite and a RTX 3070, I will be doing comparison tests on the different HMD's to find out if this is a HMD hardware issue, a GPU issue or a software issue. We might be doing this on Tuesday if all goes well.
It is annoying having to do such extensive troubleshooting as I have done, but fortunately it will likely result in a definite answer for me.