I've had this TV for nearly seven years and it's gone from my main display to my bedroom. I was watching digital cable and noticed that the sides of the picture seemed softer than the middle. To confirm, I brought up the picture guide and noticed text in the description box is much softer on either side of the screen that it is toward the center. Is this a product of age? Is there anything I can do about it? I'm Service Mode savvy, if necessary. Thanks.