Same problem here - black screen with no audio or video every few days. Very annoying and I've found only power cycle fixes. I will try the TV HDMI input change next time it happens . My equipment: XG1-v4-A, Denon AVR-X4400W Receiver, Sony XBR940D 75", Comcast 4K high speed HDMI cable from X1 to AVR; 4k high speed cable using ARC from TV to AVR.
Hoping a fix comes soon otherwise I am swapping this out to older box as there really is no benefit to the 4k box vs 1080p. Netflix is way better on the Android Sony TV app with Atmos support and a cleaner picture.
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