Sorry for spamming guys... Issue solved by my own during a lunch time...

TV has a factory setting of 'Motion plus' set to Standard. I had to switch it to "Pure" (don't know term for English language Tvs). There is also option "Smooth" (scene still distorted), Demo, Manual and Off. Wondering what first two are useful for. Hardly imagine I'll change it from "Pure" ever, because other settings is causing also digital Tv signal to be distorted.

Hope my folly helps others