Apple TV sporadically gets blurry
TV sporadically gets blurry, then after a few seconds returns to perfect focus.
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As far as I know, this happens when the network is unable to supply adequate throughput to support a full HD stream. I've read that an HD stream requires 8-10 Mbps of network. When you fall below that, you will notice the picture deteriorate. I'm imagining that 4K streaming requirements are higher yet - but I don't have experience with 4K.
This info might help:
https://www.cable.co.uk/broadband/guides/broadband-streaming/