What do you mean by getting worse? I would say it's a light bulb that's burnt out, but that seems like an awful small area if it's a bulb. Not sure what else it could be, though. I know on the '94 & up Pontiac CD players, it's very common for the single light bulb that lights up the display to go out. I've not heard of that happening to the '04 & newer stereos, but they're fairly new still, so that might be why. I'm sure they'll eventually share the same fate.