Halo in new Samsung LED TV
Just hooked up new 55" Samsung LED TV (UN55H6350) and so excited to start watching it. A few things have happened in the first few hours of watching:
1) A very annoying halo, big circle shows from the top of the middle of the TV.
2) Picture every now and then dims on its own to a much darker picture/image
Do I have a defect or is there a setting I don't know about? Not looking forward to packing it up and exchanging, but cannot be stuck with a lemon.