I bought my TV about a year ago and rarely watch it. When I first got it, there were a cluster of dead pixels in the top right corner of the screen. It's about 20 or so pixels in a cluster. Didn't bother me at all cause they were on the edge so I never RMA it (regret this). Then I turned it on about 2 months later and the cluster moved to the center left of the screen. Now they just moved to the center right. I was just wondering if anyone had any idea what could be causing this? Included a pic. Thanks!