So I got a used Vibrant from someone on CL in Seattle, got it rooted, unlocked, and running Cyanogen mod. No problem, right? I wish.

Intermittently, I've been getting this weird fuzzy-screen issue, where parts of the screen (the top 4/5ths) will just get a bit...blurry. I can't really trace it to any specific time or reason, though it does tend to happen more in the top and bottom 20% of the battery, and while charging.

Basically, I'm hoping if people can tell me whether I should just relax and not worry about it, or if this is the sign of a dying screen (gods I hope not) or battery (lame, but still okay). If anyone can shed some light on this, I would be greatly appreciative.