TV Pixellating

My main tv started it doing this the other week, after unplugging and plugging back in everything I discovered it was the aerial, I’d moved the tv unit when cleaning and the cable was in a different position from normal so the plug in bit wasn’t sitting square and not connecting properly it’s fine since I sorted it.
I hope it’s as simple for you.

Cables can be the issue.
If you have a Satelite dish it can be the LNB (the thing on the end that sticks out) getting old or the dish slightly out of alignment. With digital broadcasts now via Satelite the dish has to point very precisely at the correct spot in the sky.

My TV did it for ages, one repair man told me to unplug the dvd player from the TV, it stopped for a while, but came back, but after having a new aerial for the first time since the mid 8os, it`s definitely stopped.

Thanks all. DH spent ages yesterday swapping cables, aerial points, all a mystery to me. Ended up with no picture anywhere, not even pixelated!
Today he’s moved the wall tv from the dining room to bedroom, seemed ok when he switched it on, so will see later this evening if I can get Coronation Street.
I don’t ask for much in life, but do like a telly that works!