I have got a sony 40EX520 TV. It is about 2 and a half years old. In the last week it has developed an intermitent problem where the IR receiver on the TV stops working. I have several  TV remotes that can all control the TV, and when this happens none of them work. So it isn't the remote. Normally when you press a button on the remote, the light on the TV flashes to show it has received the signal, but when this occurs, the light doesn't change.  I also changed the batteries in all the remotes to make sure. Also it isn't the room lighting interfering, as I turned off all lights to see if that made a difference. I have also turned off the TV and unplugged all devices from it for a few minutes and turned it back on, and the problem continues. The buttons on the side of the TV all continue to work. However maybe after 20 minutes the IR receiver starts to work again. It has happned 3 times in the last week. Previous to this, it never happened. I also have the latest sony firmware, and nothing else has changed or been connected to the TV for months. Anyone know what the issue could be. Because it is intermittent, I can't really take it in for repair, because the problem is unlikely to reoccur when they test it, and I don't know what triggers it. I basically find that after watching the screen for a while, when I want to turn it off, or change the volume, it doesn't work, but it can go for days without it reoccurring. I do have a Sony home theatre (is a listed compatible device for this model) connected to it via HDMI which has been connected since December. But this problem occurred both when I had it connected, and after I disconnected it for testing, so I don't believe that has anything to do with it. Anyone have any ideas or come across this type of problem before?