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and mine, I seeing random black frames ever 30 seconds or so in BBC iPlayer through not in any other apps

same question I have 6 total 

I have 4 different 4k TVs no older than 2021 I have 4 Chromecast with Google TVI have 2 Chromecast ultra 4kthere is not a single combination of them that this does not occur with, and we have all tried factory resets which made no difference at all.

Did you all send feedback from the home app?

Netflix is also fine for me