Newtons Rings

[gambit07]

Hey guys, wondering how many other people are experiencing Newtons Rings and whether or not it coincided with running Android. Here's a picture of Newtons Rings

I was running android with it charging and it just popped up as I was watching the screen. I'm actually pretty certain from what I've read about newton's rings that it probably isn't related to android, unless maybe it's a heat thing. However I have read a couple of people saying that it happened while they were running android as well so I thought I'd ask. My first TP2 had this happen when I kept it in my pocket, but it was bad enough that the touchscreen didn't work at all right away. When I got my new one I didn't keep it in my pocket and I didn't have a problem until now. This one isn't that bad since I can use the screen but it can definitely be seen, I'm hoping it doesn't get worse but we'll see.