Just had a new Sony 65" installed before Christmas 2017 (12th Dec 2017) and suddenly there are two or three pixel horizontal lines acroos the width of the screen, they seem to change colour at times , red, white blue ot black...but not in sync with rest of picture.

Tried different sources of picture and same pixel lines persist. Hard powered off TV for 20 minutes and then over night, problem persists after cold boot .

Sources tried - all see same pixel lines

(a) Sky Q

(b) Blu-ray player

(c) Apple TV

Running the latest firmware on TV (Android) and the lines even appear in TV Home screen