I have extended warranty, but per my understanding this is normal and not covered by warranty. Are you sure?
It is not a "dead" spot per se, it is a region with dimmer pixels where the subtitles are. Tried running the rejuvenation thingy even twice, it didn't assist (and I know it just kills the other pixels so it looks the same)
I tried all tricks with disconnecting connecting, connecting to other, changing between 5 and 2.4, it always fails after a few minutes.
I'm using now my nvidia shield for netflix, until LG fixes it (which I doubt they will)