Oled tv screen burn

I've got exactly the same issue with an LG OLED bought November 2016. Slightly galled I have to say by commenters suggesting it's the users fault for not doing their homework before buying, or not using the TV properly (I use mine to watch TV, what else should I use it for - washing the dishes?). I read a number of reviews of the TV before I bought it - they were all glowing, it was 5 star rated by most and decribed as one of the best TVs around and worth the expense ('What Hi Fi' for example - I won't be trusting their reviews again). Not one review mentioned the risk of screen burn. Also galled by the fact LG and the retailer John Lewis have the audacity to entice you to buy the products by offering guarantees, and then don't honour them. The fact they claim the guarantee doesn't cover screen burn tells you they know full well it can and probably will occur. Therefore it's a flaw in the technology and LG should never have marketed it. For the fact they did, any consumers let down by the issue shoud be fully compensated. Oh, and for the record, my screen burn has resulted from brief repetitions over time rather than long periods of the same image. I have Sky TV and whenever you interact with the set top box (which has to be very often) an onscreen box pops up which has little command icons like 'delete'. That bright yellow 'delete' icon has burned in despite my using the TV with standard settings, and safetey features turned on. LG OLEDs should have been marketed with an upfront, unmissable warning "not recommended for use with set top box menus, game consoles, channels displaying logos or other fixed graphics". But then no one would have bought them, so they kept it quiet. Dishonest trading as far as I'm concerned.