TV has random cluster of black pixels that change locations

[smigz]

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!
Pictures : https://imgur.com/n34LpEa https://imgur.com/9X0R205

 

[Rifter]

Have you tied different HDMI cable? if not do that.

 

[smigz]

Have you tied different HDMI cable? if not do that.

Ya, I've tried different HDMI cables, different inputs on the TV, different reciever. Thanks for the suggestion though!

 

[razel]

Since it's moving around and smudgy, it kinda hard to tell from the pic, but perhaps there's debris stuck in the layers of the screen itself? My LED LCD once had an ant crawling in between the layers and we saw it's black shadow watching TV once. I know.. you'd think those layers wouldn't have enough room, but there was.