Judder on LG C2 TV connected to Sky Q

[WGJC]

Issue is occasional picture judder on LG C2 TV . The judder is present for both static and moving images . The effect is quite disturbing for my wife who suffers from vertigo. When judder is present it is there for all Sky channels and recordings and is independent of the the programme content. Only cure appears to be switching off the Sky Q box.  No judder is present for FreeView and any TV apps at the same time as Sky Q judder . The judder is also present when cycling through all the LG video modes (cinema, expert.......). Any advice much appreciated- Sky and LG seem to want to blame each other.

[Chodley]

What do you mean by judder if it includes static images?