is it just me getting wound up, getting old, but why does the tv picture jump at the start of some of the progs. The opening scene seems stretched then flicks and things look normal. Also why do the end titles jump prior to the trailer for the next programme. Rant over.
Those are the digital tv equivalent of what you used to see on analogue tv as ghosting or snow etc. They are products of interference or weak signals which digital tvs make up for by using slightly older signals to fill in the missing parts.
An antenna booster may eliminate such problems or you might have reposition your antenna.
sounds like you've the tv is set to automatically adjust the picture aspect ratio - a black border on a broadcast programme can make the tv switch between 16:9 and 4:3
Mine does this, I think it's cos am using an old type TV with the 4:3 screen and the prog being aired is 16;9, so it starts of big and then flips into the widescreen mode.