Hi Prog - thanks for an answer.

I just rephrased what user: racerua wrote earlier in this post.
"Due to hardware limitation, accessing RF status(power or quality) may interrupt streaming through USB. As for no issues with TVR - it reads RF status only during tuning or poor stream reception."

TVR ...

Hi all,
I have exactly the same problem.

And I guess the same one is here https://forum2.progdvb.com/viewtopic.php?f=2&t=13306
"Signal quality have 80+ but sometimes program have a lot graphics artefact like have not much signal strength and watching tv is not good"

I tired other demux settings ...