I posted this in the Amazon Fire TV Owner's Thread but I figured I'd also try my luck here since it affects my ST60 as well.
My Fire TV is having issues with intermittent signal loss via HDMI directly connected to my 50ST60. The signal loss happens at random intervals, usually for about one second, where the screen goes black and audio cuts out. I've tried using different HDMI cables and switching HDMI ports on my TV, setting display to various resolutions, but I'm still getting this problem.
I also tried testing the Fire TV with other TV's I own to see if it is a defective unit or an isolated problem on my Panasonic plasma. After hooking it up to both a Samsung LCD TV and even my Asus 23 inch computer monitor, I didn't experience any signal loss whatsoever. This leads me to believe that the Fire TV is not playing nice with the ST60 for whatever reason.
Is the ST60 known for having any HDMI issues with Android devices? My Xbox 360, Intel NUC mini PC and cable box work on the TV just fine. Any help would be appreciated.