I've been having the HDMI handshake issue since mid-2019. If I switch inputs on my Samsung TV to something else and back or unplug/plug the HDMI back in, the feed instantly returns. Replacement of the X1 box and all HDMI cables made no difference, seems to be an inherent flaw and making me want another provider when my contact is up. Lowering the video to 1080p did not seem to resolve the issue for me as I saw mentioned, not that I'd be satisfied with that workaround.
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