It’s still happening. Only on Sky Comedy (as far as I can tell) and only once or twice an hour now so far less than it used to be - i think always during the programmes rather than adverts.
It is the only channel effected yes. But it seemed ok at times. I’m not noticing it today but it was there over the last two weekends and has been in some of my recordings. E.g American Auto last week
I’m in London. Same issue yesterday and today. Glitching picture and white speckled drop-out on all programming and adverts on Sky Comedy. Other channels seem fine.