My 55" KS8000 started doing the periodic black screen + no audio every few minutes after shutting down my Xbox One (HDMI 2) this morning and switching to the cable STB (HDMI 1). Tonight while turning on the cable STB I noted an odd resolution display in upper right corner but didn't record it right away so I don't recall it exactly (4xxx x 2xxx 24bit?). I went into the cable STB (Cisco CAV10242HD) Settings - Appearance - TV Type and changed from Auto to UltraHD TV. The periodic black screen & audio loss has stopped since doing that. The screen resolution displayed in upper right corner when HDMI 1 is selected is UHD 3840x2160 / 60P HDMI UHD Color. I think that the periodic black screen and audio loss may be the result of the TV not syncing properly to the cable STB source. The Cisco STB may also not be properly communicating with the TV which results in the unusual resolution instead of the expected UHD one. FYI, My TV still has the factory original 1122 firmware in it because I don't want ads on the menu overlay.
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