Ok, so I've already replaced the TV with a new one, and moved this tv to my room once the symptoms started showing.
Now they are getting worse, a 3rd of the screen has a constant black/fading flicker and I am trying to figure out if it's the LED/LCD bulbs dying, or a capacitor problem.
I'd like to try and fix the tv one day, since parts are available and cheap and wanted advice was all..
Here are the symptoms
At first the flickering would last an hour or two, but now it's almost constant.