I'm not sure if someone else has run into this issue, but I've been following this thread since it started and I don't think so.
On my 65" X930C, when I turn it on from power off (normal power off), sometimes my screen is just black. The TV menu still works, it shows the source in the top left etc, but it's as if it's ignoring the video part of the HDMI signal, as I can hear the sound but I see nothing. It also doesn't matter if I switch the source to something else, it's black no matter what I do. This has happened quite a few times with some time in between each occasion. The only way I've managed to "cure" it, is to completely restart the TV (unplug, plug back in, start up). I've tried both HDMI1 and HDMI4 (ARC) as inputs but it doesn't seem to matter. I doubt it could be a faulty HDMI cable as it seems if it would be the problem, then the audio would fail too? But I'm no expert in that area.
My second issue is that sometimes the TV goes into what I can only call "stutter" mode, where the video stream gets super choppy. At first I thought it was my media server (QNAP 451) but after a while I realized that it was the TV. Even the menu at this time (which is already slow in general) gets incredibly choppy. Again, the only cure is to restart the TV. This has also happened with some frequency.
I've ensured TV is on latest firmwares etc.
I've contacted Sony support via mail but I reckon I'll have to call them as they've not replied. But before I do I just wanted to check if anyone else has run into something similar?