So I've got a new KD55AG9 and it's supurb. An amazing piece of kit. But a couple of days ago it started playing up, not switching to TV properly and not showing a nice tesalated screen when there's no signal and a few other things, weird things.
Anyhoo, I shutdown and played with the setting, retuned and was on the verge of doing a factory reset when I thought about looking at the apps I had installed. Well a couple of days ago, when these troubles started I had installed a Smart Home App called Tuya....so I uninstalled it and Voila!! All the nitty little problems resolved themselves. It was this horrible app causing all the problems.
So it's just a heads up to try uninstalling apps when things go sideways!!