I'm having the handshake problem. I go 4k box to Sony reciever to Sony TV. Sometimes everything works fine. Other times I get a black screen. Sometimes unplugging the power to the cable box will fix the issue but sometimes not. Sometimes unplugging the HDMI cable from the reciever and plugging it back in works but sometimes it doesn't. Sometimes I need to turn on my xbox so I get a picture then I can plug in the cable box and it works. This has been very frustrating. This has been going on for months for me.
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