I am fed up with the series of issues with my Samsung UN48JU6400 TV . When I bought the TV back in 2015, I experienced intermittent black screen issue while using HDMI port. When I contacted Samsung they came and changed a circuit board. But still I was facing the issue. So, I stopped using HDMI and left it without fixing . Now most of the apps in the TV stopped working after the software upgrade, so I am forced to use streaming device (Roku) connected to HDMI and the black screen issue is back again. I am facing the same issue in gaming devices like xbox. Is there any solution yet for this issue ?