I have a bravia kdl 46v5100 set and noticed intermittent blackouts with this tv before - the signal would cut out and the screen would go blank and after a second or 2 would come back with the 'HDMI 1' message in the upper left hand corner, but it always has done it when only watching cable tv, never with any other devices. Now that I updated the software to v 4.12xxx I'm getting the random black screen through any devices, whether it be blu-ray, dvd or cable, sometimes a couple times in less than 30 secs but then not again for a while, sometimes coming back with a snowy picture and I have to press the 'sat/cable' button again to get it to come back, sometimes a few times. I refuse to replace my HDMI cables AGAIN as i've heard that could be part of the issue. They are not cheap and I replaced them for this reason last time only for the problem to come back again in the past.
Before doing it I contacted sony customer support and they reassured me that there shouldnt be any problems, but now they are worse than before the update. I made sure the update was for my specific model of tv beforehand.
Anyone else have these or similar issues?